minor code changes to heliospectra.py
add heliospectra s20 to ini chamber ini template
change config modes in heliospectra module
add CsvFields bimodality to heliospectra module
[chamber.ini] changes for both heliospectra models

- restructure groups for both S10 and S20 models
Merge pull request #36 from kdmurray91/s20

S20 changes, v0