Fix change_bin to use lbin_vector in the dat file to specify Lbin_lo and Lbin_hi

Bins were specified using actual measurements where they should be the bin
number (i.e. bin 1 and bin n). Now bin_vector does not take an argument
for type = "cal". More checks need to be done to make sure this change
does not break other things but Cole wants to test the functionality as
well so I am pushing it.