Release: bump VERSION_DEVEL.
Release: bump VERSION_DEVEL.
Release: bump VERSION_DEVEL.
PO: update template.
Release: update news.
Generate a .pe script for one design size at a time.

In make

 a b: c
   command

is shorthand for

 a: c
   command
 b: c
   command

this means that in parallel builds the same command may be invoked twice.

Fix this by associating each command with only one target, and adding
dummy dependencies. Also, generate the .pe for only one design size at
a time.
Merge remote branch 'origin/release/unstable' into HEAD
Release: bump VERSION.
Revert "Generate a .pe script for one design size at a time."

This reverts commit 366316fd6be846c2050be6b1b3955b261026187e.

See <URL:http://permalink.gmane.org/gmane.comp.gnu.lilypond.devel/58153>
for the rationale