Log Message:
Update kscope to 1.6.0.

Changes since 1.5.0:
* Improved: Updated the documentation
* Improved: Implemented multiple-call nodes in the call-graph
* Improved: Workspace toolbar buttons re-arranged
* Improved: Hitting Enter in the "Open Project" dialogue's list of
  recent projects opens the selected project
* Bug fix: Handle file extensions correctly in the file list
* Bug fix: Avoid hanging status bar messages when a project is closed
* Bug fix: Prevent infinite loops in the file finder in the presence of
  recursive symbolic links
* Bug fix: Child windows should not disappear when dialogues are invoked
* Bug fix: Added padding to the call graph, to avoid chopped-off drawing
  of nodes close to the borders
* Bug fix: Honour the preferred font when drawing the graph
* Bug fix: Delete temporary dot files used for drawing graphs
* Bug fix: Save call-tree files when a project is closed
* Bug fix: Clean-up a project's directory name after it is created

Maintainer update by Martijn van Buul via PR 37701.