Debug target different from release target

New file in object list: modwritestarcube.f90

metadata in output file is now 'version'
this version number now comes from git

modwritepartcube.f90 becomes modwritedmcube.f90
the name of the subroutines in this file also changes
and call to these subroutines changes in pfof_snap.f90

Selectwritecubetype becomes Selectwritepartcube
Writecube become Writepartcube
modwritecube.f90 becomes modwritepartcube.f90 in Makefile