Reduce visibility of helpers

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Error messages should use errorPrint*

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Don't need the return value

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Remove superflous comment

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Whitespace

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Remove dead code and outdated comment

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Changed reduceToInt to reduceToLong

We have abandoned the use of ints already a while, this should have been changed as well. Guess, BigInt arithmetics are undertested...

[NOTE, the new Java 8, longValueExact might be interesting to avoid boxing]

Signed-off-by: Stefan Marr <git@stefan-marr.de>