Implements combined short boolean values

[xxxserxxx]

Addresses part of #1: implements combined shorts. Caveats:

These are equivalent:

-a -b -c
-abc
-bca

The equals assignment must be stand alone. While these are equivalent:

-a -B=foo
-a -B foo
-aB foo

these are not:

-aB=foo

Also, the old behavior was that parameters which took arguments, for which arguments were not supplied, were not errors; therefore, both of these were valid within the same program:

-a -b -C=xyz
-a -b -C

In the latter, C was given no value, and it was as if it was not provided on the command line. This is probably a bug, or behavior that should be different... however, I did not change it. Therefore:

-a -b -C=xyz
-a -b -C
-abC
-aCb

The last three are identical, and the same as the old behavior.