[Pyparsing] Put fnumber in pyparsing?

[Peng Yu]

Hi,

Things like fnumber in
http://pyparsing.wikispaces.com/file/view/fourFn.py/30154950/fourFn.py
is very convenient to use. I'm wondering if this can be considered to
be put in pyparsing so that users don't have to copy and paste from
pyparsing examples. Thanks.