Main method extracted to separate file to make it easier to test the _rest_ of the code.
munit is added as a submodule by running `cd src; git submodule add https://github.com/nemequ/munit.git` .
Unit testing has so far only been tested on ubuntu.
* Add build generated files to .gitignore
* Fix error in "last all" output and resolve Wunused-result warnings
- Check return value of several standard library calls that could
return error states.
- Fix issue with "last all" command (it sent tabs for alignment
that were reinterpreted as colors).
* Fix buffer overflow in do_export_zone command
