Move test suites to separate directory.

Beware, this will break test execution for most people.
Make sure to add `./test/suites` to your path to overcome this!!
Remove broken `pointReductionTest`

Eventually, we should make a similar test, but right now this
function is completely broken and small enough to discard.
Rebuilding from scratch should be the way to go.
Rename `matlab2tikz_acidtest` -> `testMatlab2tikz`

It was never a real ACID test anyhow. For compatibility, leave
`@ACID` as the default test case, though.
Document changes in test in README
Merge branch 'moveTest' into develop