use 48 bit url hash for lock keys again.
query reindex recs can just use their
prob docids as fake uh48s. we need it so we
can avoid the fakedb record and just use
the spider reply to trigger a 5-second
lock expiration. a little simpler. added
logdebugspiderwait for waiting tree debugging.
fixed per ip spider limiting. fixed losing
spiders down blackhole from updateCrawlInfo.
check UrlLock::m_confirmed when counting outstanding
spiders on one ip since may have a lock on one host
but not get granted on all! it calls
confirmLockAcquisition() when it gets fully granted
the lock so it can set UrlLock::confirmed.