fixing catch syntax and removing unique index so that upgrade on openacs.org runs without problems (probably other db's out there have the same issue).
Merged oacs-5-6 to HEAD. HEAD now installs and passes all core tests. Theremay still be some lingering problems due to my screwing up the oacs-5-6branch earlier, I'll be looking into this later.
- Fixes typos in ctl files- Adds new iso-639-1 language codes- Adds iso-639-2 language codes (3 chars) data file. Will add datamodel and logic for it very soon- Bumps version number to 5.6 serie for future inclusion in core