Document #3580
Fix doc string typo.
Nordugrid_gahp crashes on failed CWD command. #4318

If the server doesn't return a 250 response code to our CWD command, the
gridftp library invokes our callback with an unallocated buffer. Test
for NULL before dereferencing the pointer.
Startd crashes on reconfig if NUM_SLOTS=0 #4327
missed doc change of default value of a knob #3284
Merge branch 'V8_0-branch' into V8_1_6-branch