CRUSH 2.41-2 updated release

This updated 2.41 release brings new flatfields and a slightly tweaked
calibration for HAWC+, as well as workarounds for some of the
astrometry glitches experienced during FS15. It also fixes a sign error
with non-central SIBS-Y positioning, and eliminates a flux reporting
discrepancy between console output and the logs. All relatively minor
changes, which nonetheless elevate the HAWC+ reduction quality.