Add a few scripts.
Add some semi-generic build and update scripts.
Modify default command and host to be SVN.

Submitted by:	Mark Johnson <markjdb@gmail.com>
Do not set PREFIX within the jail unless a custom PREFIX has been set.
This should fix the build of Linux ports.

Reported by:	swills
Merge branch 'master' of github.com:markjdb/marcuscom-tinderbox into sv