Resource Finder: added findFileByName method
Added documentation for directories searched by ResourceFinder
Added ResourceFinder tutorials from iCub repo
Added documentation for yarp-config utility
Added documentation to configure data installation in external projects
typos fixed
added RF tutorial for file installation with cmake
doc reorganization
fix minor typos in documentation
revised doc
linking tutorials
RF documentation: removed tutorials/ directory from RF examples; updated RF files installation tutorial to use example from RF basic tutorial, and yarp-config page to use the tutorials as example case