Removes a previously applied lock on a table.
procedure UnlockTable(LockType: TLockType);
Call UnlockTable to remove a lock previously applied to a table. LockType specifies
the lock to remove.
Removing a read lock enables other applications to read a table. Removing a write lock enables
other application to write to a table.
An application can remove both types of lock by calling UnlockTable twice, once for each