Propagate changes to the line index into the GUI code

[yeganer]

This should fix #790

[wkerzendorf]

@yeganer thank you for your help. I think it is easier if we simply reindex within the gui to line_id as this is specifically the index that is being saved.

[yeganer]

I thought about that. Both indices have their benefits in my opinion. Using atom_data, ion_number, ... makes several filtering operations a lot easier and straight forward.

[unoebauer]

Hi @yeganer - just tested these changes with tardis_example:

config = tardis.yaml_load("tardis_example_new.yml")
mdl = tardis.run_tardis(config)
from tardis.gui import interface
interface.show(mdl)

After the gui fires up, I try to show the line info in some wavelength window and it still crashes with the same error.

[unoebauer]

The minimal change to fix this error is (and I tested this!) to do

self.lines = lines.reset_index().set_index("line_id")

in tardis/analysis.py on line 27 and

self.lines_data = lines_data.reset_index().set_index('line_id')

in tardis/gui/widgets.py line 962.

[yeganer]

@unoebauer This is very strange because it works on my end. If the error is the same, then it looks like the changes made by this PR were not applied.

[unoebauer]

@yeganer - turns out that I still had pandas 0.19.1 installed. Updated to 0.20 (as requested in the conda env file) and everything works.