ADDED: new TaskScannerPluginTest case which checks the handling of status thresholds (w.r.t. total warning count)
ADDED: appropriate method in TaskScannerAction to retrieve the "Plug-in Result:" output
ADDED: a further file set which is necessary for the new test case
CHANGED: added a FIXME in AbstractCodeStylePluginAction as the reliability on the position of a certain warning number in the summary table is not given, i.e. the particular function may not return the desired warning number