Added support for the new current_reloads table - this table is intended

to contain a list of reloads currently in processes. It is filled by
os_load, and is cleared out by the tmcd 'reset' command or by nfree.
The tmcd 'loadaddr' command now uses this table instead of the reloads table.

Also added Frisbee support to sched_reload, and changed the Frisbee command
line option to os_load to '-r' to avoid a conflict with sched_reload's '-f'
option.