Properly free GHashTable in properties window

Closes #178
https://github.com/mate-desktop/mate-file-manager/issues/178

I had to recover two functions previously removed in eel-glib-extensions.
Merge branch '1.6' of github.com:mate-desktop/mate-file-manager into 1.6
Remove m4 and rely on autofoo to pull them in
Remove pregenerated doc files, will be generated on every build
Remove ltmain.sh, autofoo will bring it in
Add update-icon-cache config option for makedistcheck

Otherwise the cache file is left behind and make distcheck fails.
Rename INCLUDES to AM_CPPFLAGS in Makefile
Remove obsolete distro folder
Merge pull request #187 from infirit/1.6

Add disable-icon-update for distcheck / various cleanups
Bump version to 1.6.3
Revert "Fix for x-caja-desktop windows at login"

This reverts commit d116bf8ba8be698869fef81b30d576bcacf3234c.

Revert because it does not solve the problem and it causes problems
for users with other docks like plank. See issue #211.
Merge pull request #215 from infirit/1.6

Revert "Fix for x-caja-desktop windows at login"
Remove old unused COPYING-DOCS file

See:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=738537#10
https://git.gnome.org/browse/nautilus/commit/?id=f933accf04863e3e0f5828e9ba7655861057c2bc

Closes #251
https://github.com/mate-desktop/caja/issues/251
Add manpage for caja-autorun-software

Closes #114
https://github.com/mate-desktop/mate-file-manager/issues/114
Bump version to 1.6.4
Remove COPYING.DOCS from EXTRA_DIST
Don't create tar.gz
Add description to caja-autorun-software manpage

Patch by Mike Gabriel
Closes https://github.com/mate-desktop/caja/issues/254
Include autogen.sh in tarball

Closes https://github.com/mate-desktop/caja/issues/253
Merge branch '1.6' of https://github.com/mate-desktop/caja into 1.6