Resolve "Run Number Selection Changes"
- Added the ability to use strings/numbers interchangeably for IPTS numbers, run numbers, and sample thicknesses (this wasn't requested but seemed wise).
- Added the ability to use single-sample "12345, 12345" run number specifications. I had to remove the comma delimiter on comboboxes to support this, so if you want to submit more than one run number to a combobox you have to hit enter or select from the dropdown list.
I don't like what I've had to do to support the second point above. Please try to break it and let me know what you think about how it feels.
Closes #23 (closed)