Early version - remove _text_tables

This is an early version of some code that i'm currently benchmarking (with both myisam and innodb)

We've had users complain before about ID's not matching between bug_table and bug_text_table. there's a bug on tracker for this somewhere. bugzilla/eventum etc store the bug description inline.

I've not yet rebased to latest master.


I don't think we really need this optimization.  It would also leave behind the last batch of notes if (total notes MOD 100 > 0).