EFUN: m_delete

SYNTAX:
mapping m_delete( map, index );
  mapping map;
  mixed index;

DESCRIPTION:
M_delete removes the index:value element with an index equal to 'index'
from mapping 'map'.

RETURN VALUE:
If the mapping does not have an element pair with index 'index',
then the original mapping is returned. Otherwise it returns the
changed mapping.

SEE ALSO:
mappingp
mkmapping
m_indices
m_values
m_sizeof

EXAMPLE:
mapping mp;

mp = ([ "a":1, "b":2, "c":3, "d":4 ]);
mp = m_delete( mp, "a" );
// mp is now ([ "b":2, "c":3, "d":4 ]).
