Reduce sets when they are added.  Fixes a problem reported on the forum.
Merge pull request #160 from Alex-Jordan/niceTablesPatch

I had forgotten to change this line when I changed it from pccTables to ...
Merge pull request #159 from dpvc/patch-sets

Reduce sets when they are added.  Fixes a problem reported on the forum.
Have set addition produce an actual union, so it is controlled by the reduceUnions flag.
Merge pull request #161 from dpvc/patch-sets

Have set addition produce an actual union, so it is controlled by the reduceUnions flag.

I've tested these changes and they look fine.  Thanks for running this down.
Fixed bug where parserRadioButtons wasn't printing itemize enviornment in hardcopy.
Merge pull request #162 from goehle/radiobug

Radio Button Hardcopy Bug
fixed bug with niceTables.pl