ctkXnatResource download function implemented
Replaced Qt5::Gui dependency with Qt5::Widgets.
Merge pull request #511 from kislinsk/command-line-modules-require-qt5-widgets

Replaced Qt5::Gui dependency of CommandLineModules/Core with Qt5::Widgets.
BUG: Fixed missing list elements problem

When there are two strings with the only difference that one is longer (e.g., "Label Statistics" and "Label Statistics (BRAINS)") then one of them is missing from the search results.

The problem was that QAbstractItemModel::match was used for checking if the string is already in the model and by default Match uses Qt::MatchStartsWith option.

Fixed by using Qt::MatchFixedString.
Merge pull request #512 from lassoan/fix_menu_combobox_search_missing_item

BUG: Fixed missing list elements problem
Merge pull request #506 from tomdoel/xnat-resource-download-fix

ctkXnatResource download function implemented
Added an option to skip install commands for plugins.
Using : as separator might conflict with absolute paths on Windows.
Ensure CTKVisualizationVTKWidget build with VTK6 and python disabled.
Merge branch 'fix-vtk6-python-disabled-build-error'

* fix-vtk6-python-disabled-build-error:
  Ensure CTKVisualizationVTKWidget build with VTK6 and python disabled.