sanitized logging

* adapted logging levels
* removed all printStackTrace()
* make use of the {} notation on each logging statement
Merge branch 'feature-sanitize-logging' into devel

Conflicts:
	webofneeds/won-core/src/test/java/won/protocol/Executor.java
	webofneeds/won-matcher/src/main/java/won/matcher/cli/MatcherCLI.java
	webofneeds/won-node/src/main/java/won/node/protocol/impl/NeedProtocolNeedClientEmptyImpl.java
	webofneeds/won-node/src/main/java/won/node/protocol/impl/NeedProtocolNeedClientImpl.java
	webofneeds/won-node/src/main/java/won/node/protocol/impl/OwnerProtocolOwnerClientEmptyImpl.java
	webofneeds/won-node/src/main/java/won/node/service/impl/NeedCommunicationServiceImpl.java
	webofneeds/won-node/src/main/java/won/node/service/impl/NeedFacingConnectionCommunicationServiceImpl.java
	webofneeds/won-node/src/main/java/won/node/service/impl/OwnerFacingConnectionCommunicationServiceImpl.java
	webofneeds/won-owner/src/main/java/won/owner/protocol/impl/OwnerProtocolNeedServiceClient.java
	webofneeds/won-owner/src/main/java/won/owner/service/impl/OwnerProtocolOwnerServiceImpl.java