src/base/descrip.mms, src/base/Jamfile, src/base/rules.mk:
Adding a new API called "FT_Get_BDF_Charset_ID" to retrieve
BDF-specific strings from a face. This is much cleaner
than accessing the internal types "BDF_Public_Face" defined in
FT_INTERNAL_BDF_TYPES_H
* include/freetype/config/ftheader.h: removed obsolete macros like
FT_SOURCE_FILE, etc.. and added cache-specific macro definitions that
were previously defined in <freetype/ftcache.h>. Added comments to be
included in a new API Reference section.
* src/*/*: removed the use of FT_SOURCE_FILE, etc.. now, each component
needs to added its own directory to the include path at compile time.
Modified all "rules.mk" and "descrip.mms" accordingly..
