Extended split() (and hence splitfields(), which is the same function)
to support an optional third parameter giving the maximum number of
delimiters to parse.

Set Tk variable argv0 to classname passed in to Tkapp_New.  (Fred)

frozen code.

Fix leak and unchecked error in complex().

sys.argv[1], effectively merging the fields.

maximum number of delimiters to parse; e.g.
splitfields("a,b,c,d", ",", 2) -> ["a", "b", "c,d"].

optional third argument gives a maximum number of delimiters to parse.
The new function splitx() is like split() but returns a list
containing the words as well as the delimiters.

longer complain that __getinitargs__ is an ugly name.

codegen.

moved some urls around, reformatted.