Compression of MPS

[josepamigoo]

Addition of compression method for MPS and their auxiliar functions. Perfromance tested correctly for MPS with real tensors. Some issue to be fixed when using Complex Tensors ( proabably related with u and v tensors, although they are each other conjugates)

Minor modification on svd truncated as well

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 63 lines in your changes missing coverage. Please review.

Project coverage is 45.33%. Comparing base (6753076) to head (93e8d56).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/MPS.jl	0.00%	60 Missing ⚠️
src/Numerics.jl	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #332      +/-   ##
==========================================
- Coverage   46.15%   45.33%   -0.83%     
==========================================
  Files          36       36              
  Lines        2472     2517      +45     
==========================================
  Hits         1141     1141              
- Misses       1331     1376      +45     

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