improve error message for process_select

This messge is a bit cryptic:
 * "Unacceptable model uncertainty examining processes"

This commit will show which process causes this issue:
 * "Unacceptable model uncertainty examining process(ganglia  20877     1 20877 17.3  3.2 2230968  0 1077096  3 01:17 01:48:23 /usr/sbin/gmond --pid-file /var/run/gmond.pid): `3 != 1077096  3`"
I think you've used backticks.  Our usual idiom is to use apostrophes (a.k.a. 'single quotes' despite their ASCII definition); and it would be better to put them round each string separately, so `'%s' != '%s'` to limit the scope for confusion of the text `!=` appears in either column's version.