Added python bindings for ctkCheckableHeaderView

[kerim371]

ctkCheckableHeaderView used to be missing in python #793.
I modified CTK such that class constructor: ctkCheckableHeaderView(Qt::Orientation, QWidget *parent) is now accessible from python.
Also I moved two overloaded methods ctkCheckableHeaderView::checkState(...) to public Q_SLOTS so they are now also accessible from python.

[kerim371]

I can see that CommitCheck doesn't bypass my commit. Do I need to fix that and if so where can see the rules for commits?

[jamesobutler]

The CommitCheck wants an appropriate commit prefix. See https://github.com/Slicer/Slicer/blob/master/CONTRIBUTING.md#how-to-write-commit-messages-.

Also another check wants this branch up-to-date with the master branch. Your branch currently doesn’t have the 2 latest commits from master.

[jamesobutler]

Note that ctkCheckableHeader stuff was also fixed as part of #796, but never integrated.

[kerim371]

@jamesobutler Hi,

Thank you for the tips, after few hours of struggling with git commit's messages I've finally corrected them

Note that ctkCheckableHeader stuff was also fixed as part of #796, but never integrated.

I guess my PR wont be redundant either #796 is accepted or stays abandoned

[lassoan]

@kerim371 Thank you for your contribution. Sorry for taking this long to integrate.