* Add support for BusyBox less as pager
* Run tests/syntax-tests/update.sh to update tests
* Address reviewer's concerns with pull request
* Revert all changes in `test` directory
* Minimize overall diff size
* Detect busybox from separate helper function
* Pass equivalent options to BusyBox from same code by changing from long to
short options
* Remove redundant `if` statement from previous commit
Add test for invalid utf-8
Add `parse_less_version_busybox` to test for invalid program
Add commenting around short options
