kappa: Fix GRP leak
smurf: Note need to run polpack:polrotref on calcqu output NDFs
smurf: Use focal plane Y as ref direction when finding POL-2 block end

This should not make much difference - it just makes a small change to the
length of time slice blocks used by CALCQU.
smurf: Use focal plane Y as reference direction when creating simulated POL-2 data
smurf: Ensure current WCS in calcqu output NDFs is SKY
polpack: Fix POLROTREF bug that caused wrong POLANAL orientation in output NDFs