#338 Add SQL-syntax check and incorrect statement accention

[Starikov Sergey]

I'm testing (trying to use) latest Linux buid (2014-09-29 snapshot aka trunk [r5141]) of TOra.
And want to see in TOra a feature of SQL-syntax check.
Combining some way highlight of correct (and correctly placed) SQL operators with underlining incorrect places in statement.

Ideally (maybe not in initial commit), this feature should be combined with autofit (together with access check) database objects names (tables, sequences and so long), showing querying status (SQL Developer doesn't do it).

Also it may be reasonable to prevent TOra from trying to execute obviously incorrect statement (stable releases probably should not contain errors, so this feature should be enabled for "Release" build type, details see in bug #890).