* include/gphoto2-filesys.h:
* libgphoto2/filesys.c: Cache files, too.
* libgphoto2/camera.c: Use cached files if exist.
* camlibs/konica/library.c:
* camlibs/sierra/sierra.c: Cache files in the filesystem.
git-svn-id: https://svn.code.sf.net/p/gphoto/code/trunk/libgphoto2@2175 67ed7778-7388-44ab-90cf-0a291f65f57c