First commit.
Tutorials only for now.
Implemented 70% of `hepta_ssa.m` into `ssa.py`.
Renamed old `ssa.py` to `ssa_turorial.py`.
Some pep8 adjustments.
Minor update.
Added MultiTaper Method.
Removed `mtm/mtm2_orig.f`.
Download test data.
Merge branch 'master' of https://github.com/ocefpaf/python-ssa-mtm