Problem:    Ex command info contains confusing information.
Solution:   When using the NOTADR flag use ADDR_OTHER for the address type.
            Cleanup code using NOTADR.  Check for errors in
            create_cmdidxs.vim.  Adjust Makefile to see the errors.
b731689e85

Use Lua's "assert()" to make an invalid command definition
a compilation error.

Misc changes:

Remove 'RESTRICT' flag.
Neovim does not support "restricted" mode
since commit 7777532ceb.

TODO:
Do not generate files before Lua assertions
so that CMake always runs the generator script
if the previous build has an invalid command definition.