Improvements to distant messaging (does not work yet)
- removed unused code (mainly tunnel handling code, messaging invite code)
- added signing/encrypting/verification/decrypting of distant messages
- added data based signature check method in GxsSecurity
- removed fingerprint from GRouter
- published all self Identities into GRouter. Will put more section later.
- fixed some prototypes in GxsSecurity


git-svn-id: http://svn.code.sf.net/p/retroshare/code/branches/v0.6-IdCleaning@7195 b45a01b8-16f6-495d-af2f-9b41ad6348cc