Conical grain type can only have 'Both' inhibited ends option

[chmns]

On line 20 of conical.py only 'Both' option is listed for the inhibitedEnds property array, leading to the UI only being able to select this.

openMotor/motorlib/grains/conical.py

Line 20 in 9e4d6fd

self.props['inhibitedEnds'] = EnumProperty('Inhibited ends', ['Both'])

However in the rest of the code there appears to be sufficient code to calculate the burning for all 4 types (Both, Neither, Top, Bottom), e.g.

openMotor/motorlib/grains/conical.py

Line 89 in 9e4d6fd

if self.props['inhibitedEnds'].getValue() in ['Neither', 'Bottom']:

[reilleya]

Sorry for the delay! There was some bug with calculating the regression of uninhibited conical grains, so I disabled them temporarily to get the rest of the release out. I would like to fix this, so I'll mark this as a bug to remind myself.