SVN_SILENT made messages (.desktop file)
Remove annoying debug statement

Occasionally prints huge amounts of lines
Prefer custom include directories over system ones.
Open project configuration dialog when trying to add missing includes

When trying to resolve missing include issues for files belonging to
a project show the project configuration dialog instead of the
CustomIncludePaths one. As the latter should be shown only for files
without project.
Add context menu entry to modify include directories

This entry is accessible by right clicking on the #include directive.
Remove unused member