Split out GSL tests from base ones

Move GSL tests into Numeric.GSL.Tests, separate the main into TestBase.hs and
TestGSL.hs.

In hmatrix-tests.cabal:

- Split the test suite into a -base and -gsl ones
- Add a `gsl` configuration flag to select GSL tests
- Add a benchmark section

One can now run hmatrix-base tests suite and benchmarks with:

    cabal configure --flag=-gsl --enable-tests --enable-benchmarks
    cabal tests
    cabal bench

1 files changed, 3 insertions, 0 deletions

diff --git a/packages/tests/src/Benchmark.hs b/packages/tests/src/Benchmark.hs
new file mode 100644
index 0000000..b37993a
--- /dev/null
+++ b/packages/tests/src/Benchmark.hs
@@ -0,0 +1,3 @@
+import Numeric.LinearAlgebra.Tests
+
+main = runBenchmarks