Allow to set a default, with NULL allowed
Improved foreign key function

It now allows for separation between on update and on delete
Improvements :)

- Fixed type-o's
- Improved info function, so you can ask for specific info
- Fixed a bug in checkTableExist, wich didn't return the object at first
- Improved reliability of makeQuery & build with triggers
General improvement and generalization

Make a general table, trigger and query create function
Support for zerofill & code cleanup