Cleanup done while researching the Boost Jam internals. Added better implementation description comments at many places. Cleaned up the 'dependant' and 'dependency' terminology that got mixed up in several places. Renamed several functions to use underscores as word separators.
[SVN r48480]
are very annoying --- e.g. you might decide there are several msvc
installation just because you have default location as long name, and there's
vcvars32.bat in PATH, and PATH element uses short name.
* jam_src/pathsys.h
(short_name_to_long_name): New function.
* jam_src/filent.c:
(file_dirscan): Call 'short_name_to_long_name' on argument.
* jam_src/pathunix.c:
(ShortPathToLongPath): Move here from pwd.c, and fix bugs:
'.' and '..' elements were completely broken.
(short_name_to_long_name): Implement here.
[SVN r18401]
