improved routing algorithm. Fixed several bugs.

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@7269 b45a01b8-16f6-495d-af2f-9b41ad6348cc
removed dsdv that was re-enabled probably by mistake

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@7270 b45a01b8-16f6-495d-af2f-9b41ad6348cc