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Make new \emph overlay aware

Closes #1

See merge request !1

-  requirement for numerically stable progressbar implementation

- beamercolorbox cannot have zero height anymore

This is, in part, in anticipation of changes to the progress bar. In the past I had troubles with computing numbers when documents reach a 150 pages. For the current implementation of the progress bar this might not be the case, because it uses TikZ. But: Let's see.

This fixes #1