PF-478: LDAPMasterHandler: catch LDAP exception on login.
TeamEventAttendeeDO as nested class added.
Nothing (typo in doc).
set(beanFactory, resourceSettings) splitted into 2 setter methods.
Moved most init stuff to ProjectForgeApp.
PluginRegistry changes.
Unused property task.tree.select.title removed.
PropertyDelta.clazz is added now automatically by continuous-db.
Updates now the context user (ThreadLocal) always from UserGroupCache.
NPE fix if user isn't really available (in maintenance mode e. g. if db table user has to be patched first).
Merge branch 'master' into multi-tenancy

* master:
  NPE fix if user isn't really available (in maintenance mode e. g. if db table user has to be patched first).
  Updates now the context user (ThreadLocal) always from UserGroupCache.
  PropertyDelta.clazz is added now automatically by continuous-db.
  Unused property task.tree.select.title removed.
  PluginRegistry changes.
  Moved most init stuff to ProjectForgeApp.
  set(beanFactory, resourceSettings) splitted into 2 setter methods.
  Nothing (typo in doc).
  TeamEventAttendeeDO as nested class added.
  PF-478: LDAPMasterHandler: catch LDAP exception on login.

Conflicts:
	src/main/java/org/projectforge/web/UserFilter.java