Re: making a release

### GNOME Objective: distcheck

By obsolescence, Planner code has become non-buildable.

This "project" aims to make Planner conform to "GNOME Objective: distcheck".

The expected outcome is a 0.14.7 release.

     $ tar xf planner-0.14.7.tar.gz
     $ cd planner-0.14.7
     $ ./configure
     $ make
     $ make check
     $ make install
     $ make installcheck
     $ make distcheck
     ================================================
     planner-0.14.7 archives ready for distribution:
     planner-0.14.7.tar.gz
     ================================================

Right files should be installed in the right places. Throughout the 
process, the build system should not complain at all.

No backward compatibility is required from the build system.

No code is expected to change. The installed application should work 
properly. It is not mandatory.

References:

1. Planner repository at https://git.gnome.org/
2. Planner/Build bugs at https://bugzilla.gnome.org/
3. <https://wiki.gnome.org/Initiatives/GnomeGoals/DistCheck>
4. <https://wiki.gnome.org/Initiatives/GnomeGoals/ModernAutotools>

-- Plan outcomes, not actions.