Require a minimum Rogue version

[bengineerd]

Description

Set the minimum Rogue version to 6.1.0

Details

In 6.1.0 we changed it so that bitSize is no longer necessary for arrays.

            self.add(pr.RemoteVariable(
                name        = "Mem",
                description = "Memory Array",
                offset      = 0x0000,
                numValues   = nelms,
                valueBits   = 32,
                valueStride = 32,
                bitSize     = 32 * nelms, # This is no longer necessary
                bulkOpEn    = False,
            ))

But if it's not set, older rogue will default to bitSize=32 then fail.
Then the uses gets a cryptic (to them) error from inside library code they don't know.
When the real problem is just that they need to update rogue to match the version of surf they are using.

We could do this individually for each Rogue python file that needs it, but that seems difficult to manage.