* libgphoto2/Makefile.am
* libgphoto2/gphoto2-context.[c,h]: New files
* libgphoto2/gphoto2-abilities-list.[c,h]
(gp_abilities_list_load_ctx): Sample function for showing the
benefits of above new files.
* frontends/command-line/main.c: Use gp_abilities_list_load_ctx to
make that operation cancellable.
git-svn-id: https://svn.code.sf.net/p/gphoto/code/trunk/libgphoto2@3793 67ed7778-7388-44ab-90cf-0a291f65f57c