Imported Upstream version 3.1.12
Merge tag 'upstream/3.1.12'

Upstream version 3.1.12
Imported Upstream version 3.1.13
Merge tag 'upstream/3.1.13'

Upstream version 3.1.13
Imported Upstream version 3.1.14
Merge tag 'upstream/3.1.14'

Upstream version 3.1.14
New upstream release.
Update Standards-Version to 3.9.5. Update watch file, adding pgpsigurlmangle. Add upstream-signing-key.pgp.