MOOGSILENT as alias

[alexji]

Currently SMHR assumes MOOGSILENT is in your path. However, users may have MOOGSILENT as an alias, in which case our "which" command does not work. One alternative is to use "type" in the try-except chain.

This can be fixed here:
smhr/smh/radiative_transfer/moog/utils.py

Thanks to Ian Roederer for reporting.