close only SearcherManagers of projects which are gone upon reindex fixes #1200

More project prefix matching improvements This is a follow-up to the fix for #1074. Project.getProject() currently creates a copy of the project list and sorts it on every call. This is more work than necessary. A single pass through the unsorted project list should be enough to find the longest matching prefix. The patch also fixes a bug which would cause getProject() to think that the path /foof/bar would be in the project with path /foo, if there was no project which had the path /foof.

make the test more robust

change getProject() to use longest prefix matching fixes #1074

Bug #3077: Project not added to configuration