fitter does not honor mask

[Chris Phillips]

When using the fitter, the mask used in set_scan did not seem to be honoured:

msk = scan.create_mask([-20,-40])
f = fitter()
f.set_function(gauss=1)
f.set_scan(scan,msk)
f.fit()

The final fit was outside the masked region

[Malte Marquarding]

I have just tested this using a channel mask and it worked.

I am pretty sure I am using a channel mask in the fitter even when the x values are in velocity, which is incorrect.

[anonymous]

Fixed in trunk. Mask got overwritten internally by a 10% edge mask.