To add last couple features for GXS before 0.6 release

- group update 
- sharing admin and publish keys
- tighten up security
made branch for v0.6 work.
First of the V0.6 changes.
  - Adding basics for proxy connection.
Removing old services, serialisers and other references for:
	- forums
	- channels
	- tunnel
	- blog
	- gamelauncher.
	- distrib.

Note this majorly breaks the GUI, for the moment.
removed uninitialized memory read
pqihash now uses Sha1CheckSum
Show gray icons for not subscribed lobbies.
Fixed some typos and added new strings to translation (Patch from Henry)
Updated english translation
fixed uninitialized memory read when sendign a message to a lobby that was previously unsubscribed
fixed bug in pgp handler causing trust info to not being saved correctly
fixed potential uninitialized memory read in PeerUploadInfo
removed the 1 from the 1st column of the keyring
removed one unused member of PGPCertificateInfo
added auto-creation of extensions directory when not present
Switching on GXS by default.
switching rs data directory to ./retroshare6 for the moment.
Removed Forums / Channels / Blogs stuff.
and made GUI recompile.
updated version number to 0.5.5 prior to release
update version string
Fixed encoding of special chars in RetroShare link after patch in revision 6600.
Added space to encoding and changed encoding to hex (e.g. %20 instead of %32).
drop corrupted config files instead of looping into them