Formatting changes only.

Refs #10707
Delay raising first time dialog until event loop is processing.

If not, the dialog appers below everything on OS X as raise() does nothing
Refs #10707
re #10707 attempt at better scalaing using px in stylesheets
Refs #10718.  Added the support on parameter to smooth background.

And cleaned up the outputs as well.
Merge branch 'master' into bugfix/10707_startup_dialog_z_order

Conflicts:
	Code/Mantid/MantidPlot/src/Mantid/FirstTimeSetup.ui
Refs #10707
Merge remote-tracking branch 'origin/bugfix/10707_startup_dialog_z_order'
Added setR getR and python test Re #10768
Added better tests Re #10768
Merge remote-tracking branch 'origin/feature/10718_add_bkgdsmooth_gui'
merge in master to solve ui conflict re #10772