quant: don't bother with extra temp variables
quant: return signal cost from getRateLast(), do not include lambda
quant: pass curCostSig to getCodedLevel as an integer
quant: readability nit
quant: rename absLevel to level, remove diffLevel
quant: minor cleanups
psy-rdoq: implementation of psy-rdoq  (highly experimental)

This initial version is storing a temp variable in TComTrQuant to avoid adding
even more parameters to getCodedLevel() and it is ignoring scaling lists in the
unquant operation. Currently, you may need large psy-rdoq scale values to have
any real effect.  It needs lots of testing.