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Resolve "Replace Copyright text by a more discrete watermark."

Closes #118

See merge request !168

Resolve "Outdated documentation"

Closes #110

See merge request !161

Resolve "CMake error when trying to install a CEP dependent on another CEP"

Closes #119

See merge request !167

FIXED by simply checking if an extension is already installed in the install dir before importing its target

# Conflicts:
#   sdk/libraries/core/application/Application.h
#   sdk/libraries/core/viewer/Viewer.h

Resolve "More coherent MISR tutorial actions GUI"

Closes #82 and #116

See merge request !166

This is the first stage in separating the frame editor in three actions

QToolbox widget took too much vertical space. With
a QTabWidget, there is more space for the parameters.
Also align the target list on top.

call to getWidget should be done _before_ setting the parameters values,
as sometimes the parameters are re-initialized in the getWidget()
action depending on the currently selected component(s)
E.g. in the "Manual Threshold Filter" action, getWidget() re-compute
the "Low Threshold" and "High Threshold" values, min/max and steps
depending on the voxel values of the currently selected target
component image

Also reset FullHead.mhd from original data

Plus: Frame editor manages precision in order to display 0.0
when values smaller that 1e-6 (which happen often due to
cos/sin precision in rotation matrix)

The cast filter is only useful when saving to 2D images.
vtkMetaImageWriter can handle any data type, just let it
do it.