Beta-Release 5.7.4.201303201653

[Heiko Böttger]

Bugfixes

Core
* redesign of cache update and change notification to ensure cache coherence across sessions
* fixed queries executed on session interface from inside a writejob refering to old resourcepool states leading to wrong result in some cases while also adding old entries to cache

Diagram
* regression: delete and hide doesn't update gui caused by template function link bug fix in 5.7.3, this is fixed by the redesign of cache update