Fix ctkColorDialogTest2 time out

ctkColorDialog::getColor() already pops up the dialog, there is no need to
exec the app. It would otherwise hang there as no window is shown.
Remove ctkColorDialog warnings when not using nameSignal

If not provided, the nameSignal property is const char* 0. It is a valid
QVariant, but it can't be used to connect/disconnect.
Merge branch 'ctkcolordialogtest2-timeout'

* ctkcolordialogtest2-timeout:
  Remove ctkColorDialog warnings when not using nameSignal
  Fix ctkColorDialogTest2 time out
Use Q_DISABLE_COPY Qt macro everywhere in CTK
Merge branch 'use-q_disable_copy-macro'

* use-q_disable_copy-macro:
  Use Q_DISABLE_COPY Qt macro everywhere in CTK
Cross reference ctkPathLineEdit, ctkDirectoryButton and ctkPathListWidget
Merge branch 'ctkdirectorybutton-see-also'

* ctkdirectorybutton-see-also:
  Cross reference ctkPathLineEdit, ctkDirectoryButton and ctkPathListWidget