Changes:
v2.7
	- POA name has been changed to bidirLogService
	- SIGTERM and SIGINT can be used to properly shut down LogService
v2.6.1 
	- a few bug fixes and code improvement
v2.6
	- use of forwarder for log service (add the LogORBMgr class and the right idl and implementations)
	- Fix static compilation problem (manual ar ruv liblog.a <source>.o)
v2.3
	- modify some string decalaration to avoid warning from gcc
v2.2
	- migrate from autotools to cmake building process
v2.1 
	- add DIETLogTool

v2.0
	- changed the behavior when a component is signing in:
	  When trying to add a new component, we check if the name of the component exists and if the component is reachable
	    + if the name already exists:
	      - if the component is reachable, then we do not connect the new component
	      - else we consider that the component is lost, and we delete the old component ant add the new one
	    + else add the component
	 The components have to implement a new method: test(), used to test if the component is reachable
	
v1.0    First version. Filtering by tags and components, dynamic attachment of
	tools and components, autogenerated names, stored systemstate.
