#714: error occured when using XMP metadata import
#716: Incoming mind map did not have monitoring attributes under certain
#720: fixed errors on opening / deleting mind maps in Docear

made sure that the right mode was selected beforehand
#720: fixed errors on opening / deleting mind maps in Docear

Under help: "Bug reports" linked to old forum
#720: fixed errors on opening / deleting mind maps in Docear

some changes and refactoring after change to docear core properties
#720: fixed errors on opening / deleting mind maps in Docear

a file deleted from workspace reappears after closing the map:
- added listener for workspace model events that looks for opened maps
and removes the file url if necessary
some bugfixes
#720: fixed errors on opening / deleting mind maps in Docear

deleting mind maps in workspace cleans all file(url) tracks of the map
if it was opened
file path problems when workspace folder was renamed

the file path remains incorrect if a parent folder is renamed in the
workspace
localized some http status messages

-5xx codes and 408, 413, 414 are now bundled into one error message
-404 (not found) has its own message
some refactoring
n/a
Merge branch 'master' into beta_8

Conflicts:
	docear_plugin_core/src/org/docear/plugin/core/CoreConfiguration.java
	docear_plugin_services/src/org/docear/plugin/services/communications/features/AccountRegisterer.java