(#844) View Mapped Megabyte details in 'r' command output

[gurcei]

An initial attempt to update the 'r' command to show the currently selected MB.

This will be a draft PR just to allow for @gardners to assess how I went about implementing it, to see if he has any concerns with the approach.

More discussions on this topic were in the discord thread here:

• https://discord.com/channels/719326990221574164/1180181054473109514/1342842360886853682

[gurcei]

Got some additional thoughts from gardners on discord:

gardners — Today at 10:34 AM
In principle should work. Note that a BRAM is 4KB, so if you have increased the size, it will need more BRAM, and will break all A100T targets. So keep the total size no larger than it was.
Also, note that we have CPU tracing via ethernet as well. It limits CPU to ~5MHz when running, but logs continuously.

Okies, as I reduced the history depth from 1024 to 512, overall, the total ram size has dropped from 24 KB to 16 KB.

I've never tried cpu tracing via ethernet before, maybe I'd better learn about that first and assure it still works ok before venturing further with this.