Mysql fix

On this PR:
- A big bug on tests with assertTrue,strings of failure were considered as True. Fixed, but now I must comment examples with accents and unicode chars, it's not working
- repair/check/optimize mysql module function fixed for identifiers quoting
- big test on theses function with 3 tables Innodb/MyIsam/Memory, but the more interesting fact is theses functions could act on one table or several.
- quoteidentifier made public, could be used outside of the module (like in the state) for query building.
- some more complex names examples in unit tests