Fixed a ton of warnings

We've been getting cryptic warnings, saying to turn on -feature for more
info.  Did so, and discovered that we're tripping over SIP-18.  Went and
added "import language.thingy" in all the relevant places, so we now
compile clean.
Got Definition Lists working in QText

Not as hard as I might have feared -- took an hour or two.  Having the
test suite for Actuarius already in place was a *big* help.