Added more files to be ignored, including RAT configuration files and Eclipse stuff.
Replaced hardcoded initial hit times for double limits. This seems to avoid crashes caused by the use of DBL_MAX and DBL_MIN.
Removed hardcoded loading of G4_Gd.
Added support to fall back to GEANT4 NIST database for elements and materials.
Replaced G4cout by the internal logging mechanisms in Materials.cc.
Merge remote-tracking branch 'origin/master' into corefix2
Merge pull request #5 from nbarros/corefix2

Assorted lot of core fixes and functionality improvements