bug#18940: Acknowledgement (24.4; vc-hg does not disable pager, leading to hangs (at least with tramp) )

[Daniel Pittman]

Additional notes:

Ideally, we should set `HGPLAIN=1` in the environment, but we can’t actually do 
that successfully if this is run with tramp: tramp doesn’t carry across 
`process-environment` to the remote system in `process-file` or similar 
commands.

Setting it unconditionally in tramp-remote-process-environment does fix the 
problem with no other changes applied, for files accessed via tramp.  Given 
`process-connection-type` of `t`, I suspect that a local instance will still 
have problems unless that is set in the local envirnoment.