Upgrade to muParser 2.2.3

[GoogleCodeExporter]

muParser 134 has a few bugs that have been fixed in 2.2.3.  Notably, muparser 
134 will confuse parameters beginning with "and" or "or" for the logical 
operator.

Original issue reported on code.google.com by justinshogg on 22 Mar 2013 at 5:05

[GoogleCodeExporter]

Please note that muparser 2.2.3 has replaced the "if" function with the ternary 
operator (cond ? iftrue : iffalse). Consequently, an "If" function must be 
implemented statically by NFsim to permit evaluation of "if" functions in BNG 
math expressions.

Original comment by justinshogg on 22 Mar 2013 at 5:07