Customised interface to SQLite.

These classes are (slightly) modified copies of the ROOT TSQLite* classes (apart from TSQLiteRow which is an unmodified copy).

They are here for 2 reasons:

• KaliVeda relies so heavily on the TSQLite interface that we need it even if the installation of ROOT does not include TSQLite (as long as sqlite3 is available of course);
• modifications have been made to enable concurrent read/write access to the sqlite database by several processes/threads at the same time, which is not possible with the basic interface.