Packaging enhancements for AIX and Solaris.

- AIX: Changed the pre-deinstall script to unconfigure
       to address an issue where failed deinstallations
       caused follow-on problems
- Solaris: Removed symlink from /usr/bin to allow installations
           into local zones
Merge pull request #76 from aleibl/develop

Packaging enhancements for AIX and Solaris.