Use SAL_INFO() instead of commented-out SAL_DEBUG() for now

Less hassle when committing, as even a commented-out SAL_DEBUG()
triggers the commit hook to complain.

Change-Id: I8cab87f204622624602fde3543630f073a558069
Make the scaling with the "tile/context" ratio optional, too

It just confuses things, for me at least... It's enough to keep the
scaling from our "decitwips" to twips to pixels in your head.

I am now finally starting to understand what is going on;)

Change-Id: I0dca2722105914de41d1ce017410cb5a05cf32c4