#2 Can't properly parse runs of operators

[Javier Kohen]

The parser gets confused by runs of operators. For
instance, 1+-1 causes a NullPointerException because
operator +- can't be found.

I guess it's possible to fix the parsing code, but the
block that parses operators looks particularly messy,
despite that the rest of the code in this package is
pretty clean as far as I've seen.

[Javier Kohen]

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I just posted a patch that fixes this issue:
http://sourceforge.net/tracker/index.php?func=detail&aid=1241355&group_id=64328&atid=507093
.