Support added for compressed presentation styles.  This halves the amount of padding for the logo -- and thus, technically,
breaks the logo terms of use -- use at your own peril!

Support added for frame numbers with the theme options:
- framenumber
- totalframenumber

Thus a new valid usage is:
\usetheme[darktitle, cabin, compressed, framenumber, totalframenumber]{UniversityOfManchester}