don't attempt to restore settings from old qt-settings config file We changed the default settings file name in 2019. It's time to let the old name go. * resource-manager.cc (resource_manager::resource_manager): Don't attempt to copy settings from old qt-settings file used by Octave prior to March 2019.

## Include script globals.m which defines global variables
define_globals

## Test for presence of a global variable defined above
if (! isglobal ("c"))
  error ("global variable 'c' not defined");
endif