Adding crossflowMovinFramePBC; updating gitignore; Simulator: adding argument for velocity in initAnnular(); Model: adding b.c.kind 'wallInflowVNeg' in setGenericBC() to account for y-vel downward.
mainCrossflowPBC: setGenericBC(uRef,vRef) was passing uinst,vinst as arguments. Fixed; Adding total_velocity, relative_velocity in savevtkpbc for plotting in InOut. Adding correction for stepSLPBCFix to account for the particle-leak upward, i.e. xp - L, as opposed to xp + L.