squashme: Keep request timeout at 2 minutes for now

No need to lower it now.
squashme
Add logging to Completed which node completed the request
squashme: add comment
Re-introduce mapAskFor (so that we don't waste getdata messages with only 1 inv in each one)
Improve askfor logging

Conflicts:
	src/net.cpp
Add debug "tx" and "tx2" options