[bug #60954] [troff] implement environment renaming and/or removal

[G. Branden Robinson]

Update of bug #60954 (project groff):

                 Summary: [troff] implement environment removal => [troff]
implement environment renaming and/or removal

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Follow-up Comment #4:

I spent some time in env.cpp
<https://git.savannah.gnu.org/cgit/groff.git/tree/src/roff/troff/env.cpp>
thanks to bug #62036.

Deleting environments will be a pain.  If an environment whose deletion is
requested is in the environment stack, we either have to refuse the deletion
request or rejigger the pointers in the singly-linked list to jump over each
sequence of deleted list nodes.  Pointer manipulation--how hard could it be? 
We should delegate the task to a second-year computer science student...

On the bright side, I only imagined accepting one environment name argument at
a time on a deletion request.  That would simplify the stack-editing logic,
however making `evrm` (or whatever we call it) asymmetric with `rm` at the
interface level would be kind of a bummer.

So maybe refusing to delete an "active" environment, as Dave terms it, is the
best way to go, if/when deletion is undertaken.

(Renaming should be simple.  An environment's name is dumb data inside a
structure.  Nothing maintains references to it except its parent.)

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