BGQ - Fix issue if user runs multiple sub-block jobs inside a multiple
midplane block that starts on a higher coordinate than it ends (i.e if a
block has midplanes [0010,0013] 0013 is the start even though it is
listed second in the hostlist).
BGQ - Add midplane to the total_cnodes used in the runjob_mux plugin
for better debug
BGQ - Fix uninitialized variable from commit
0c00d359f27c8c88bf7a8af9c5f5fee8c6d9fb15
BGQ - better debug in both selecting steps and launching them in the
runjob_mux.
BGQ - change some "DEBUG" messages to "TRACE"