show fingerprint in ConfCertDialog, and splitted the string with spaces. Removed the use of the ambiguous peer id for both pgp and locations ids

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@6900 b45a01b8-16f6-495d-af2f-9b41ad6348cc
Channels:
- Use destination directory when manually downloading a file from a channel
- Show destination directory in channel details
- Fixed utf8 issue when choosing the destination directory

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@6902 b45a01b8-16f6-495d-af2f-9b41ad6348cc