ignore .DS_Store files (Mac pocket lint)
cmake: add CHECKED_BUILD option so we can add optional runtime checking
check: add checks for integer overflow in rdcost functions
log: add the RateFactor for each frame to the csv file when using --crf mode
slicetype: avoid redundant call. intraSatd costs are updated in frameEncoder already
ratecontrol: avoid clipping QP multiple times when VBV is not enabled.
ratecontrol: remove RateControl->qpNoVbv.

Less confusion, and we have whatever info we need in rce->qpNoVbv anyway
ratecontrol: remove repeat initialisations.