Fix man task tracking

This commit adds a man page entry for the new --task-tracking
flag.  It also changes the SKIPIF for the man page verification
flag so that it runs in qthreads rather than fifo mode, in order
that developers are more likely to run into it sooner rather than
later.

In putting this together, I noticed that I had failed to alphabetize
the flag correctly even though I remember thinking about it, so
fixed that while here as well.