Implement progress bar

[loelschlaeger]

Write own code for progress + ETA output. Remove dependence to "progress" package.

[RouvenM]

Own Progress Bar has been added (yet still local, but we can change on Monday). Did not work directly, since I had to adapt and change some data structure and control structure. For example, the following problems occured:

[RouvenM]

• "Data" is somehow unclear, as sometimes data[[„source“]] is specified in sandbox but data[[„data“]] is necassery (e.g., in optimized)
• Data (which I downloaded) hat values „none“ instead of „NA“, wherefore those values did not disappear when I wanted to created starting values
• Data is loaded as character. I had to use as.numeric then
• Normally, Runs will be set to 100 in check.controls – unfortunately, it set it to 50 (I had to change manually then) - but maybe that might be due to my mistake in the code djungel ;-)