Allow users to see all blocked jobs.

Currently showq defaults to only showing normal users
their own blocked jobs, and root gets to see all blocked
jobs.  This change adds a -b option (long form --blocked)
which allows a user to see all blocked jobs.
Add an understanding of WAIT_QOS_RESOURCE_LIMIT

If a job exceeds a QoS limit you will get a warning that:

WAITING JOBS------------------------
JOBID     JOBNAME    USERNAME      STATE   CORE     WCLIMIT  QUEUETIME
================================================================================
[Warn]: unknown job state - pending job reason = 30
[Warn]: unknown job state - pending job reason = 30
[Warn]: unknown job state - pending job reason = 30
[Warn]: unknown job state - pending job reason = 30

It's perfectly valid of course, so handle it.
Merge pull request #5 from chrissamuel/master

Allow users to see all blocked jobs.