doc fix.
reWrote the docs on upgrading from a Simple Scripts (now Mojo Marketplace) installation.
removed a weird string of characters in a warning
fixed a small part of the installer so testing a POP3 account won't default to always using an SSL connection.
Trying out using tar to both ugnzip and untar and falling back to gunzip, then tar, if that doesn't work.
Added bugs fixed in v6.5.0
Release Candidate to Stable