added yarp_install macros to allow both YARP and external packages to easily install data that are accessed by YARP
used yarp_install macros to install xml files
modified ResourceFinder to look for new  folder; moved search in robot directories after context ones
ResourceFinder: added default user/sysadm/installation search paths for the APPLE case
ResourceFinder: fixed missing part to output of getDataDirs() for WIN32
removed unneeded RF default context from g/ymanager and builder
gyarpbuilder: look for 'new' directory names; cleanup formatting
When saving files, point to yarp_data_home by default; accordingly, prepare folders in yarp_data_home
added yarp-context executable (not complete); ACE explicit dependency must be removed though
Using cmake macros to create the Version.cmake file