Blue collar PR: Remove superfluous semicolons and convert tabs to spaces

[javadba]

… style CRLF.

This is truly a blue collar PR. Just cleaning up those minor details. The diffs are ugly (huge) because of removing the LineFeeds.

After having rebuilt I have:
manually eyeballed about half the files
rebuilt using sbt package
tried out iscala notebook: seems to be ok
tried out an ssc: it starts to run but can not find data (unrelated usability issue)

If this general approach were acceptable, I will manually traverse the remaining 50 or so files to ensure all look fine. The criteria:
leading tabs to 2 spaces
end-of-line semicolons removed
dos2unix type conversion (though I used a sed command to do it)

[javadba]

Due to (a) no feedback and (b) not being merged in a timely manner by the project maintainers this PR is now out of sync with trunk.