Makefile: Add some new targets

To save me some time from having to write commands. Started with a
`reinstall` target to make it easier to put a new build on my PATH.

Then added a `test-all` target so I wouldn't have to use two commands to
run both test suites. Needed to create a `test` task also in order to
run the unit tests before the integration test.

Ensure that we `cargo build` before running integration tests. Otherwise
we might be testing against an old build.

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