UI: Overall position filter

[SpiritSuperUser]

In the UI, the overall position filter behaves different for different coordinates:
while the x- and z-components are fine, the y-components are resetted when one switches between different images of a chain.

[SpiritSuperUser]

additionally, the default settings of the y-components differ from the ones of the other components:

• x and z are set to [-1:1]
• y is set to [1:1] in the UI, shown is however everything then

[GPMueller]

This is not always the case, so it is likely related to your geometry. Please specify the geometry you chose.

[SpiritSuperUser]

I have a hexagonal structure. The bravais vectors are given by hand:

1.5 -0.86602540378 0.0
1.5 0.86602540378 0.0
0.0 0.0 1.0

[GPMueller]

This should not happen anymore on the feature-imgui branch (PR #583). Since the Qt GUI is supposed to be replaced with the IMGUI being developed there, I would close this issue when the PR is merged.