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FileSwitch 2.90 introduced a register corruption bug in *Copy which
would (typically) result in an abort if the copy isn't going ahead
because the destination exists. This was down to the (undocumented)
input of R7 being corrupted by the call to EnsureCanonicalObject, and
not being restored before it gets used later on by the call to
Util_PrintName.

Fix the code to restore R7 before calling Util_PrintName, and update the
comments surrounding a couple of functions to make sure at least some of
the undocumented inputs are documented.

Fixes issue reported on forums:
https://www.riscosopen.org/forum/forums/4/topics/17802

Version 2.92. Tagged as 'FileSwitch-2_92'