Replace jbofihe vlatai with camxes-py vlatai

* Implements #26, #42, #43, #44, #9; unblocks #37, #47, #48
* Requires migration: 140607_01_new_valsitypes.sql
* Assumes camxes-py installed in local python/ directory
* Obsolete cmevla/fu'ivla to be marked separately per #47