[issue2186] map and filter shouldn't support None as first argument (in Py3k only)

[Raymond Hettinger]

Raymond Hettinger added the comment:

Will think about ifilter() and ifilterfalse() for a day or two.  The
None argument handles the common use-case and there may be a good case
for keeping it.  If I do decide to drop it, will put in my own patch
that optimized for the case with the filter function is bool().

+1 On removing the None argument from map() and imap().  It was
hold-over from the days before zip().

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