Creation of the main development line called 'trunk' from the 1.3 line.
This is as per the message https://mail.gna.org/public/relax-devel/2012-06/msg00003.html
(Message-id: <CAED9pY-a1VBPkYisEGY8-Kb_voffP6FMY1eGVpE9RBXM0dT2rA@...>).
This is part of the 2.0 relax development cycle and beyond. Instead of forking the current
development line for each major/minor version number change, all development will remain in the
'trunk'.
