tons of changes from live github on neo.
lots of core fixes.
took out ppthtml powerpoint convert, it hangs.
dynamic rdbmap to save memory per coll.
fixed disk page cache logic and brought it
back.
Merge branch 'diffbot' of github.com:gigablast/open-source-search-engine into diffbot

Conflicts:
	Json.cpp
	PageAddUrl.cpp
	PageStats.cpp
	Spider.cpp