Problem: Terminal window options are named inconsistently.
Solution: prefix terminal window options with "termwin". Keep the old names
for now as an alias.
Problem: Options test fails when using Motif or GTK GUI.
Solution: Use "fixed" instead of "fixedsys" for Unix. Don't try "xxx" for
guifonteset. Don't set 'termencoding' to anything but "utf-8" for
GTK. Give an error if 'termencoding' can't be converted.
Problem: Test_options fails when run in the GUI.
Solution: Also check the 'imactivatekey' value when the GUI is not running.
Specify test values that work and that fail.
Problem: Options test fails or hangs on MS-Windows.
Solution: Run it separately instead of part of test_alot. Use "-S" instead
of "-u" to run the script. Fix failures.
Problem: Git and hg see new files after running tests. (Manuel Ortega)
Solution: Add the generated file to .hgignore (or .gitignore). Delete the
resulting verbose file. (Christian Brabandt) Improve dependency
on opt_test.vim. Reset the 'more' option.
