v0.3.3

[pablokrupa]

• Improvements on the Matlab non-sparse solvers:
  - All solvers now have a Matlab counterpart.
  - They generate historics with information of the iterates.
  - Cleaner, more well documented and standardized code.
• Quality of life improvements:
  - Added functions to test the solvers.
  - Default options are handled better.
  - Added spcies.m function, which can be used for various purposes.
  - Easier installation using spcies.m.
• Some efficiency improvements of the sparse solvers.
• Numerous bug fixes.

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This discussion was created from the release v0.3.3.