GL: remove useless x|yStep
Spectral mask supported in numpyPCA method.
MDP based modules are only compatible with stacks of spectra.
curve picking updated
fix imageClicked
GL:use curve object directly
Correct ColormapDialog behavior.
Possibility to install fisx if present and to disable cython.
Display plot frame even if empty
bbox and pick curve optimisation
Add log support for colormap and image
Merge remote-tracking branch 'upstream/master'