Connect ng-canna to the build
- Add stage support.  Thank you xmj@!
- Use STAT instead of direct path and other portlint fixes.
- Take maintainership.

PR:		187864
Submitted by:	xmj
Use /var instead of PREFIX/var

PR:		186431
Approved by:	maintainer timeout (3 weeks)
Update to 1.11.12
Support stage
Use options framework
STAGE and simplify do-install.
Convert to USES=pgsql