MFlushTable TableNumber.w ; Empties the table to contain no items

Performs a similar function to MFlushQueue except that it performs it on a Table
object. This does not erase any data in the table, it simply resets the internal
pointer that points to the `current' item so that it is pointing to the start of
the table. At this time, this command doesn't really relate with any other part
of Mildred.