SYNOPSIS
	mapping m_delete(mapping map, mixed key)

DESCRIPTION
	Remove the entry with index 'key' from mapping 'map'. The
	changed mapping 'map' is also returned as result.
	If the mapping does not have an	entry with index 'key',
	nothing is changed.

SEE ALSO
	mappingp(E), mkmapping(E), m_indices(E), m_values(E),
	sizeof(E), widthof(E)
