Tests: fix nearest node with skeleton test
Return actual number of touched nodes after node update
Test data: add user test2 to group of user test1

This is required for some tests.
Tests: fix node update test
Test data: set user of four test treenodes to user 1

This makes the node list test work again. It was broken since we gave user 3
permission to edit user 2's data.
Remove unneeded debug output
Tests: fix node update test
Tests: add test for permission error on node update
WIP: testing travis