- cleaned up the documentation in p3turtle.h
- update tunnel time stamp only *on the way back* to avoid unsuccessful requests to update a timestamp.
- implemented persistence of which hashes are to be handled.
git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@1297 b45a01b8-16f6-495d-af2f-9b41ad6348cc