$Id: History,v 1.38 2003/10/22 13:52:26 gcosmo Exp $
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     =========================================================
     Geant4 - an Object-Oriented Toolkit for Simulation in HEP
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                      Category History file
                      ---------------------
This file should be used by G4 developers and category coordinators
to briefly summarize all major modifications introduced in the code
and keep track of all category-tags.
It DOES NOT substitute the  CVS log-message one should put at every
committal in the CVS repository !

     ----------------------------------------------------------
     * Reverse chronological order (last date on top), please *
     ----------------------------------------------------------

Oct, 22nd 2003 G.Cosmo geombias-V05-02-03
     - Migrated calls to G4Exception to new scheme.

Sep, 30th 2003 G.Cosmo geombias-V05-02-02
     - updated GNUmakefile, according to new structure introduced
       in "geometry-V05-02-00".

Aug, 22th 2003 M.Dressel geombias-V05-02-01
     - got rid off G4ImportanceFinder 

Aug, 19th 2003 M.Dressel geombias-V05-02-00
     - first implementation of weight window technique

Jun, 4th 2003 G.Cosmo geombias-V05-01-00
     - Fixes for inclusion of <strstream> in G4ImportanceAlgorithm.cc and
       G4ImportanceFinder.cc in view  of the g4std wrappers migration.

Apt, 11th 2003 M.Dressel geombias-V05-00-03
     - implementation of "IsInWorld" in G4IStore using IsAncestor of
       G4LogicalVolume

Apr, 3rd 2003 G.Cosmo geombias-V05-00-02
     - Fixed few trivial strict pedantic warnings.

Mar, 27th 2003 G.Cosmo geombias-V05-00-01
     - G4ParallelNavigator.cc: set cout precision to 12 (was 50 !?!).

Mar, 24th 2003 M.Dressel geombias-V05-00-00
     - G4ParallelNavigator.cc: modified shift mechanism
       in ComputeStepLengthShifted().

Nov, 20th 2002 G.Cosmo geombias-V04-01-04
     - changed definition of G4NSplit_Weight from struct to class
       to allow porting on Windows DLLs.

Nov, 4th 2002 M.Dressel geombias-V04-01-03
     - remove G4std:: where it does not belong to, 
     - remove G4StringConversion,
     - and added G4Nsplit_Weight.cc

Oct, 28th 2002 M.Dressel geombias-V04-01-02
     - moving interfaces G4VCellScorer and G4VCellScorerStore back
 
Oct, 22th 2002 M.Dressel internal_7_geombias-V04-01-01
     - renaming G4VPScorer to G4VScorer and  
                G4PStep to G4GeometryCellStep 
     - moving interfaces G4VCellScorer and G4VCellScorerStore to intercoms
     - adding comments 

Oct. 16th 2002 M.Dressel internal_6_geombias-V04-01-01
     - changes recomanded by codewizard
     - stream, and string conversion from file G4Nsplit_Weight.hh/.cc
       to G4StringConversion.hh/.cc

Oct. 15th 2002 M.Dressel
     removing G4Pstring with G4StringConversion

Oct. 14th 2002 M.Dressel 
     cleanup according to codewizzard

Oct. 10th 2002 M.Dressel geombias-V04-01-01-internal-5
     change in G4(V)ImportanceAlgorithm, G4ImportanceSplitExaminer
     G4ImportanceFinder: give pre and post importance 
     separatly insted only ipre/ipost.

Sep, 2th 2002 M.Dressel geombias-V04-01-01-internal-4
     moved files concerning messaging a importance geometry to
     /afs/cern.ch/user/d/dressel/G4/IGeoMessangers.
     Support will be given on demand. 

Sep, 2th 2002 M.Dressel geombias-V04-01-01-internal-3
     code cleanup for code-wizard

Aug,  29th 2002 M.Dressel int-2-geombias-V04-01-01
     renaming of G4PTouchableKey to G4GeometryCell 
     changing  G4VIStore and G4IStore 
     and dependants

Aug,  13th, 2002 M.Dressel
  removed G4VPrintableScorer.hh G4VPrintableScorerFactory.hh

Aug,  13th, 2002 M.Dressel - geombias-V04-01-01
    added G4VCellScorer.hh and G4VCellScorerStore.hh

July, 18th, 2002 M.Dressel 
   change the strategy for importance sampling:
	- G4VIStore: new function:
		IsKnown(const G4PTouchableKey &ptk)
		to tell if a cell (G4PTouchableKey) is known in the
		store
	- no biasing is applied between cells that are not known by 
	  the G4IStore and it's neighbors.
	- importance valu 0 is allowed to flag that no biasing should
	  be done betweeen the cell and it's neighbors.
    change the G4PArallelNavigator: 
        - using G4TouchableHanle
        - and LocateGlobalPointAndSetup

	  
July, 11th, 2002 M.Dressel 
  added comments in new classes

July, 11th, 2002 M.Dressel - internal-2-geombias-V04-01-01
  added clases for contruction of a simple geometry with 
  importance values and messengers.

July, 10th, 2002 M.Dressel - internal-1-geombias-V04-01-01
 change in G4Sigma: the sum over the weights is returned by GetWsum 
 (before it was GetSumOfWeights) and the weighted sum over x is returned  
 by GetWXsum().


May, 31th, 2002  M.Dressel - geombias-V04-00-04
- change name ImportanceSampler to ImportanceSplitExaminer

May, 30th, 2002  M.Dressel
- change comments in WeightWindowAlgorithm

May, 24th, 2002  M.Dressel - internal-1-geombias-V04-00-02
- Added classes for weight window biasing. 


April 10th, 2002  M.Dressel - geombias-V04-00-03
- Added comments to header files for Software Reference Manual.

April 9th, 2002  G.Cosmo
- Added liability disclaimer to all files and minor cosmetics.

April 8th, 2002  M.Dressel - geombias-V04-00-02
- Resolved compilation problems on HP-aCC.

April 4th, 2002  M.Dressel - geombias-V04-00-01
- Resolved compilation problems on SUN-CC and Linux-egcs.

March 28th, 2002  M.Dressel - geombias-V04-00-00
- First implementation of importance biasing and scoring.

March 25th, 2002  G.Cosmo
- Created.