Improve some error messages and warnings #37
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All but the last part of this PR simply rewords warnings or error messages, or reorders them on the screen (so that it reads:
reading file ... error reading file
instead oferror reading file ... reading file
).The last part was a leftover from #27. We now require a parameter to have a default value, but the function was still assuming that if the parameter is not in the input file it should crash. Instead it should just return the default value.