Changed all datetime columns to int( 11 )

All columns that had the type datetime have been changed to int(11).
All datetime values will be stored as UNIX timestamps.  Had to modify
multiple calls to the DateTime class and call the function setTimestamp
to set the correct UNIX timestamp.
Updated all old static class references

All old static class references have been updated to use the new class
DB. E.g. Instead of News::Load( ... ), we have $news->Load( ... ).