added missing imports (hiding behind global), closes #312
fixed undefined node errors in contenttypes, ref #305
start fts and scheduler thread after context init, closes #313
removed most of the unneccessary global statements, closes #314

* ignored athana and other code that will be removed soon
renaming argument for method isContainer, ref #305
fixed exception when node id is not present in child / parent cache, closes #316
full_init() required for script to run, closes #317
fixed db.get_children_with_type, closes #320

* escaping of the second param was wrong
fixed unicode name and param handling, closes #327

* fixed unicode node name handling, added unicode_name property
    * `Node.name` returns utf8 encoded string
    * name can be given as unicode or utf8 encoded str

* added yaml_pretty jinja filter
    * based on pyaml

* fixed unicode escaping / encoding in mysqlconnector
    * fixed problem with non-ascii chars
    * encode first, then escape

* decode param names to unicode in args / form
add new persistent nodes to nodecache (complex attr), closes #328
added missing file nodeclass initialization, closes #329