improved kernel implementation documentation (package.html and javadoc)

...rc/org/fortiss/tooling/kernel/ToolingKernelActivator.java

...fortiss/tooling/kernel/base/EObjectAware2ServiceBase.java

.../fortiss/tooling/kernel/base/EObjectAwareServiceBase.java

...rg/fortiss/tooling/kernel/base/PrototypeProviderBase.java

...el/trunk/src/org/fortiss/tooling/kernel/base/package.html

...ling/kernel/interfaces/IConnectionCompositionContext.java

...tiss/tooling/kernel/interfaces/IConnectionCompositor.java

...fortiss/tooling/kernel/interfaces/IConstraintChecker.java

...rtiss/tooling/kernel/interfaces/IConstraintViolation.java

.../org/fortiss/tooling/kernel/interfaces/IEObjectAware.java

...org/fortiss/tooling/kernel/interfaces/IEObjectAware2.java

...l/interfaces/IEclipseResourceStorageLocationProvider.java

...tooling/kernel/interfaces/IElementCompositionContext.java

...fortiss/tooling/kernel/interfaces/IElementCompositor.java

...fortiss/tooling/kernel/interfaces/IPrototypeProvider.java

...g/fortiss/tooling/kernel/interfaces/IStorageProvider.java

...ss/tooling/kernel/interfaces/ITopLevelElementContext.java

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

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

...c/org/fortiss/tooling/kernel/internal/LibraryService.java