Add administrative actions to Caja's right-click menu

 Caja Admin is a simple Python extension for the Caja file manager that
 adds some administrative actions to the right-click menu:
 .
   - Open as Administrator: opens a folder in a new Caja window running
     with administrator (root) privileges.
   - Edit as Administrator: opens a file in a Pluma window running with
     administrator (root) privileges.
   - Run as Administrator: runs an executable file with administrator
     (root) privileges inside a MATE Terminal.