removal of instrument uptime menu link and unused apache conf files and other minor improvements

 - old and unused apache configuration files removed
 - IL instruments removed from instrument utilisation menu (we do not have them any more)
 - instrument uptime menu link removed - target graph is broken
 - consolidated all instrument menu 70* tests in one 20 test
 - removed code repetition from bin/ga_II_checker
 - removed depricated last_30_days method from npg::model::instrument_utilisation
 - fixed the code where in test conditions operations on undefined variables
   were performed
 - removed excessive verbosity in most of the tests
 - documentation in README, INSTALL and REDESIGN_PROPOSAL updated