[Feature 76] When flagging a container type as dirty, direct children are now also flagged as dirty.
[Feature 76] Fixed logic so that the container type also gets set as dirty
access rights check updated

'nobody'-rule added ( NOT ( true ) ) to grant write addess only to adminstration users, closes #83
changed variable name to be more intuitive
ref #73
closes #73
fixed typo in docstring
ref #73
default thumbnail for document types changed

text label "no fulltext" removed from thumbnail, closes #30
as worklow admin you can now select multiple diss nodes and delete them
ref #77
closes #77
escape fields for pdf export (print)

fields with html-parts will result in corrupt pdf output. fixed by escaping values

ref #91
closes #91
pop up window now lets you confirm or cancel deletion of nodes in diss workflow
ref #93
closes #93
added js so that the submit button is disabled until a checkbox is checked
ref #93