Improves verbosity for preprocessing, extraction and enrollment; Adds more…

Improves verbosity for preprocessing, extraction and enrollment; Adds more verbosity for scoring (closes #98 (closed))

@mguenther: please let me know if these changes work to solve that issue.

I also took the liberty to improve messages for other blocks in the toolchain. These are cosmetical improvements only.

LGTM. Thanks @andre.anjos

mentioned in commit 5da50c6d

merged