Power Pack 5.2 introduces support for SSH-based connections to servers

running Cliosoft SOS. The documentation for SOS has been updated to go

over the differences between SSH and local communication, discuss

licensing, and to provide the fields that need to be filled out for SSH.
Minimum versions of RBTools and Power Pack have been updated

accordingly. While earlier versions of both work with SOS, this is early

enough in the lifespan of the SOS support that it's worth guiding people

to these versions.

Built the docs and viewed them in the new docs UI. Checked for build

errors, bad links, and spelling issues.