updated build_facet_surface() message to include a general instruction of usage.

git-svn-id: https://svn.mcs.anl.gov/repos/ITAPS/cgm/trunk@6116 6162379e-bd28-0410-9a7d-b7f4dcfcad3c
Added patch for opencascade6.6.0 release.

git-svn-id: https://svn.mcs.anl.gov/repos/ITAPS/cgm/trunk@6117 6162379e-bd28-0410-9a7d-b7f4dcfcad3c
Added an empty line to allow good interpreting for different files.

git-svn-id: https://svn.mcs.anl.gov/repos/ITAPS/cgm/trunk@6118 6162379e-bd28-0410-9a7d-b7f4dcfcad3c