Fix error in sample_mlacomp example.

Example in sample_mlacomp did not have an argument for bin_vector,
which needs to be the same as the age bins and was referencing the
wrong dat file. It needs the augmented dat file from change_bin
above it.
Fix error in change_bin

Error was left over from removing mwa and not removing a
complimentary argument, thus the dataframe was different sized.
Also I added an argument for waa while I was trying to debug.
Not sure if this works or is necessary.
remove waa from goodnames because rebase did not work and conflicted with remote