reworking decomposition mechanism

...ortiss/tooling/base/ui/action/CutModelElementsAction.java

...ui/compose/HierarchicElementConnectionCompositorBase.java

...iss/tooling/base/ui/editpart/policy/RemoveEditPolicy.java

org.fortiss.tooling.base/trunk/META-INF/MANIFEST.MF

...oling/base/decompose/HierarchicElementCompositorBase.java

...iss/tooling/base/decompose/IConnectionCompositorBase.java

...org/fortiss/tooling/kernel/ui/internal/ActionService.java

.../fortiss/tooling/kernel/extension/IElementCompositor.java

.../tooling/kernel/internal/ConnectionCompositorService.java

...iss/tooling/kernel/internal/ElementCompositorService.java

.../tooling/kernel/service/IConnectionCompositorService.java

...iss/tooling/kernel/service/IElementCompositorService.java