feat(curses): show host and protocol in title

[Komzpa]

Fixes #121.
Fixes #482.
Supersedes #585.
Supersedes #588.

Stack note: the large-counter formatter work that used to be here is now covered by #636/#637. This branch is kept on top of the newer related stack because maintainers have been merging newest-to-oldest.

Summary

• include the local hostname in the curses title
• include the active probe protocol in the same title line
• keep the counter-formatting changes out of this PR to avoid duplicating test(curses): cover large count formatting #636/fix(curses): show decimal latency scale #637

Validation

• composite newest-to-oldest stack merge through csv: omit trailing empty header field #575: clean
• ./bootstrap.sh && ./configure --without-gtk --without-jansson && make -j$(nproc) on the composite stack
• git diff --check on the composite stack
• sudo python3 ./test/cmdparse.py on the composite stack: passed