Additional GEVP method with errors (#195)

* Added the function error_gevp() to compute the gevp with statistical errors.

* Changed method name from error_gevp to error_GEVP and removed automatic gamma method

* added auto_gamma to error_GEVP

* Specified exceptions in Corr.error_GEVP

* Fixed a wrong path. It should be np.linalg.LinAlgError

* Added a test for error_GEVP

* The tests of error_gevp loads a test matrix

* Incorporated eigenvectors with uncertainties in GEVP routine

* Cleaned up GEVP routines

* Cleaned up breaking change from merge

* Released tolerance in test of GEVP

* Repaired broken GEVP test

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Co-authored-by: Simon Kuberski <simon.kuberski@uni-muenster.de>

tests/linalg_test.py

@@ -297,6 +297,10 @@ def test_matrix_functions():
         for j in range(dim):
             assert tmp[j].is_zero()
 
+    # Check eigv
+    v2 = pe.linalg.eigv(sym)
+    assert(np.all(v - v2).is_zero())
+
     # Check eig function
     e2 = pe.linalg.eig(sym)
     assert np.all(np.sort(e) == np.sort(e2))