2/6 added comments to database/sqlite.h
	modified:   database/sqlite.h
3/6 added comments to md5/md5.c
	modified:   md5/md5.c
4/6 cleanup in md5/md5.h (removed exporting private functions)
	modified:   md5/md5.h
5/6 adding comments to file/file.c
	modified:   file/file.c
6/6 adding comments for file/file.h (DONE for function specific files)
	modified:   file/file.h