This adds Caja, the Filemanager for MATE.

ISSUES
------
I don't *really* know if this is working.
The first test failed, so I had to disable it:

https://github.com/mate-desktop/caja/blob/master/eel/check-eel

And it seems like you need to have it inside of MATE with Mate-Desktop
being present in your profile?

user@abyayala /gnu/store/90qbxv8vmr88qccppi9kvq3arh8nyzi7-caja-1.18.3/bin$ ls
caja  caja-autorun-software  caja-connect-server  caja-file-management-properties
user@abyayala /gnu/store/90qbxv8vmr88qccppi9kvq3arh8nyzi7-caja-1.18.3/bin$ ./caja
./caja: Relink `/gnu/store/88wvqp60hbrdvbp0xsqad5c6njjfshcw-libpng-1.6.28/lib/libpng16.so.16' with `/gnu/store/ybpgv1v7606xw7mafda66w10hiynpiw2-glibc-2.25/lib/libpthread.so.0' for IFUNC symbol `longjmp'
./caja: Relink `/gnu/store/2sq8w3x8glbjlfn22im6nwwycmbdlzws-freetype-2.7.1/lib/libfreetype.so.6' with `/gnu/store/ybpgv1v7606xw7mafda66w10hiynpiw2-glibc-2.25/lib/libpthread.so.0' for IFUNC symbol `longjmp'

** (caja:8760): WARNING **: Error retrieving accessibility bus address: org.freedesktop.DBus.Error.ServiceUnknown: The name org.a11y.Bus was not provided by any .service files

(caja:8760): GLib-GIO-CRITICAL **: g_dbus_proxy_new_sync: assertion 'G_IS_DBUS_CONNECTION (connection)' failed

(caja:8760): GLib-GIO-CRITICAL **: g_dbus_proxy_get_name_owner: assertion 'G_IS_DBUS_PROXY (proxy)' failed

(caja:8760): GLib-GIO-ERROR **: Settings schema 'org.mate.caja.preferences' is not installed

Trace/breakpoint trap
-- 
ng0
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