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* implemented signal_handle2 through signal_handl5
* removed all implementations of signals with more than 5 arguments (nobody needs that many args and all those template instantiations just kill compile time)

refs #384

Conflicts:
	ext/sigslot/sigslot.h

* Moved campvis::Runnable interface to tgt namespace (since it's needed by sigslot, which only depends on tgt)
* Introduced sigslot::signal_manager singleton class that will manage the dispatching of signals in its own thread
* Started proof-of-concept implementation of asynchroneous signals for signal0<> and signal1<>. Both classes define their own signal_handleN deriving from _signal_handle_base, which defines the signal to dispatch.

Proof-of-concept implementation seems to work so far.

refs #384

Conflicts:
	core/tools/opengljobprocessor.h
	ext/tgt/runnable.h

Conflicts:
	application/CMakeLists.txt
	core/tools/opengljobprocessor.h

* Introducing sigslot::signal::has_connections() to check whether a signal has listeners
* Fixed default OpenGL texture wrapping

Conflicts:
	modules/pipelinefactory.h

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@489 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@335 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@192 bb408c1c-ae56-11e1-83d9-df6b3e0c105e