Cherry-pick 3.7.0's 4a3d5f95d9
(github pull request #252). Slightly tricky because the fix entry
nowgoes into a different file. fixes37.0 will need fixing up.
Submitted for 3.7.0; all but one also apply to 3.6.3.
I rewrote the curses terminal-too-small message instead of just
fixing the spelling of "minumum".
Changing from BETA to RELEASED resulted in turning off PANICTRACE
and that exposed a minor memory leak. Only applies to program exit
so doesn't impact play.
