[Halld-offline] BCAL software update

[Will Levine]

I recently checked in some changes that enable the new BCAL simulation
and reconstruction code by default. This new code treats ADC and TDC
hits separately and does timewalk corrections, among other things. In
addition, the default BCAL clustering algorithm has been switched from
the KLOE algorithm to the IU algorithm.

A few notes:

When updating to the latest code, you must rerun the simulation
(mcsmear in particular) before running the reconstruction. Old hddm
files will not work properly with the new code.

Analyzing REST files from the data challenge is still possible, but
you must use the -PDEFTAG:DBCALShower=KLOE option.

Will