Improve SQL column names: use _ separator and prefix by 'src' or 'tgt'

This will require existing databases to be reset.
Until the new normalizer is fixed, the old one is the default

Use --newNormalizer to enable it, --oldNormalizer is still legal but currently has no effect.
Convert to unix line endings

DOS line endings cause major Eclipse problems
Add deriving Show to Activity
Set up for testing interface chapter
Comment out old code and add empty chapter introduction

Somehow this step caused a lot of Eclipse problems with the C pre-processor failing on a 'dist/build/autogen/cabal_macros.h' file not found error. It doesn't happen anymore, but it's not clear what the cause was.
First draft of interface-documentation generation
Show interface roles
Show rules + Cleanup