[FYI] Merge branch 'maint' into master

[Stefano Lattarini]

commit 2ad0acea7f3114a3a1e0954154c743c14c2cfab1
Merge: e2fd8f5 1667d36
Author: Stefano Lattarini <address@hidden>
Date:   Sun May 5 00:55:26 2013 +0200

    Merge branch 'maint'

    * maint:
      maint branch: we are going to become Automake 1.14
      maint: version bump after beta release 1.13.1d
      release: beta release 1.13.1d (will become 1.13.2)
      NEWS: document more robust handling/recognition of make options
      tests: typofixes in comments in t/preproc-c-compile.sh
      tests: remove bashism from a test