look for openjdk6 in OpenBSD if v7 isn't available
jbigi scripts: look in /usr/local (for *BSD)
fix langbox alignment, bump build number
minor script changes

- mbuild.sh: don't require bash
- Slackware/i2p/doinst.sh: add bash shebang
testscripts build target: check shell scripts for validity

(also adding missing shebang lines)
remove extraneous script name
another extraneous script name