create_panel_from_sample.html:
- add column to display the sample's PnS field if present

view_project_samples.html,
view_subject.html:
- display the PnS text if present
- added button to create a panel from this sample

forms.py:
- add dummy field to PanelParameterMapFromSampleForm to display the fcs_opt_text

models.py:
- save the PnN and PnS text, the S text is useful for building a panel from a sample and just knowing more about the channel

views.py:
- in create_panel_from_sample() view, pre-populate the fcs_opt_text dummy field with PnS text from sample