* arpackmm: improve command line.
* [BUG FIX] arpackmm: run arpack with real or imag shift.
* [BUG FIX] arpackmm: make sure the restart file is written.
* [BUG FIX] arpackmm: rewrite the test.
- Do NOT use eval in bash script which does NOT return command exit code.
- Use a dedicated maxResNorm to test the residual (no point to deduce
it from tol).
* Update .gitignore.
* Update CHANGELOG.