Add some usage explanations and options for ./configure. Now debugging can be turned off, that means, assert() and malloc_options can be disabled.  And pledge() can be turned off as well.
Add some usage explanations and options for ./configure.
Now debugging can be turned off, that means, assert() and malloc_options
can be disabled.  And pledge() can be turned off as well.

turnipsi/mdl,turnipsi/mdl