fix bug in the installer

where a malicious user could create a new admin user.
fix installer

typo
bla
fix bug in the add image popup

of the wyswyg editor fields where the "file list" would only list files
from the root directory of the file manager - instead of files from all
folders.
implemented collapsible tree

on the project dashboard showing milestones, tasklists, and tasks as
well as their relationships.
more collapsible tree work
more collapsible tree work

* Messages now also listed (if grouped to a milestone)
* Milestones and Tasks that are late are highlighted in red
* Tree remembers its state per project
comments improved
more comments work
more comments work
more comments work
more comments work
even more comment work
remove unused variables

from getallprojectfiles removing an undefined variable notice
more comments work
fix caching issue
removed status filter from tasklist for timetracking-filter
adapted getProjectTrack in class.timetracker.php to accept an array of
task ids
changed task filtering for timefilter in a way, that all task are listes
changed the selection box in the timetracker filter to allow multiple
values
adapted stylesheet for the selection box
small simplification of code
removed print_r call