Port test suites to tasty (from test-framework)

[LaurentRDC]

test-framework is essentially on life support. We are easing maintenance burden by porting test suites to tasty.

Fixes #465

[LaurentRDC]

In the process of touching almost every test suite, I have noticed that a lot of packages were listed as dependencies, but not used (using the -Wunused-packages warning). I have therefore activated this flag by default for every build target, in an effort to minimize the number of unused dependencies.