Use easy parallelization

[mcocdawc]

• a couple of prange instead of range.

• use @ instead of np.dot

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 37 lines in your changes missing coverage. Please review.

Project coverage is 0.00%. Comparing base (eae7421) to head (47b2104).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...ord/_cartesian_coordinates/_cart_transformation.py	0.00%	14 Missing ⚠️
...oord/_internal_coordinates/_zmat_transformation.py	0.00%	12 Missing ⚠️
...rd/_cartesian_coordinates/_cartesian_class_core.py	0.00%	5 Missing ⚠️
.../chemcoord/_cartesian_coordinates/xyz_functions.py	0.00%	3 Missing ⚠️
src/chemcoord/constants.py	0.00%	2 Missing ⚠️
...ian_coordinates/asymmetric_unit_cartesian_class.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #119   +/-   ##
======================================
  Coverage    0.00%   0.00%           
======================================
  Files          29      29           
  Lines        2763    2762    -1     
======================================
+ Misses       2763    2762    -1     

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