stepconf -catch realtime check error if no kernal version.

put a try statement around check_for_rt.
When 2.6 is merged with UB3 this rt_check would always cause an error
and fail due to no kernel version available.
stepconf -move/add statements in the INI

Axis is very (too) forgiving about where some INI entries
are at. It will search display and trajectory headers.

Move display statements into the display heading.
add a couple of new statements to the display heading.