add_parameters KeyError when 'filename' includes path about pyemu

[wkitlasten]

More clues... line 1590 in pst_from.py, new_obs in lower, df_ins with upper:

new_obs.index
Out[3]: 
Index(['oname:troughtonfarm_daily_noavg_modelout.txt_otype:lst_usecol:et_date:2014-07-01',
       'oname:troughtonfarm_daily_noavg_modelout.txt_otype:lst_usecol:et_date:2014-07-02',
       'oname:troughtonfarm_daily_noavg_modelout.txt_otype:lst_usecol:et_date:2014-07-03',

df_ins.index
Out[4]: 
Index(['oname:TroughtonFarm_daily_noavg_modelout.txt_otype:lst_usecol:nep_date:2014-07-01',
       'oname:TroughtonFarm_daily_noavg_modelout.txt_otype:lst_usecol:gpp_date:2014-07-01'

Not sure if .lower should be applied here or pyemu.pst_utils.csv_to_ins_file()... or at all?

[wkitlasten]

commit d650683 seems to work, sorry I didn't branch and PR.