Remove dreduce test script (dreduce is no longer)
Abstracted argument parsing; win32 fixes

Converting argument parsing to use strtod/strtoul instead of sscanf,
particularly because win32 sscanf doesn't like "inf", but win32 strtod
is fine with it.

Convert output to %.7g instead of %.6f as it's nicer for small values.

Explicitly print "inf" for an infinite result (i.e. the critical value
for a test level of 0) since %f doesn't seem to do that on win32.
Error handling for bad test stats/levels

Also short-circuit the calculations for 0/infinity cases (i.e. pvalue
for infinity is 0, pvalue for 0 is 1, and vice versa for critical
values)
Committed missing parse-vals.h
Added windows compilation; deb and rpm for Linux
Added notes on building fracdist