Merge from SFTP.
Removed the --diag-supress ifdef, as it was only due to me not being able to spell --diag_suppress! (which is supported on all versions of RVCT)
=head1 FShell Documentation
L<Introduction|fshell::commands::fshell/Introduction> - an introduction to fshell.
L<Getting started|getting_started> - a guide to getting fshell up and running on various different platforms.
L<Change History|fshell::change_history>
L<Core FShell functionality|core>
L<FShell Commands|commands> - an A to Z of all the commands that fshell supports.
L<Plug-ins|plugins>
L<Developer documentation|internal> - documentation for developers wishing to extend fshell or write new commands.