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Minor code rewrite, add flexibility

calc_cog: fixed bug for asymmetric input data, return data ordered by
axes
find_mla_grid: option to copy data or not (Default is to copy), add
option to tweak return data format
Add test suite for shwfs.py
Add test routine
Implemented binning for read_file
Added tests for binning when reading
Docstring formatting
Added support for clipping, multiple dimensions

- Clip option subtracst scalar from data.
- Now also supports 1- and 3D data
Update version
Removed +x flag
Split off xcorr test suite
Changed meta info
Split off util tests
Split off log tests
chmod -x util.py
Code cleanup, fix

- Change numpy N to np
- Cleaned up unused code
- removed unused covmat_in / zern_covmat_in from code
Make plotting optional, import numpy as np
No unittest requried anymore
Isolate numpy usage to single test
numpy as np