Merge branch 'MBsysPy_hotFix_algebra' into 'dev'

MbsysPy HotFix algebra

See merge request robotran/mbsysc!411

MBsysC/mbs_interface/MBsysPy/mbs_algebra.py

@@ -210,8 +210,9 @@ def cross_product(v1, v2, vres=None, index_1=True):
     if vres is None:
         vres = np.zeros(3 + index_1)
     # For faster reading, terms are aligned.
+    index_1 = int(index_1)  # required as array[True] is not array[1]
     # For comprenhension:
-    # index_1 alone is index [1]
+    # index_1       is index [1]
     # index_1 + 1   is index [2]
     # index_1 + 2   is index [3]
     vres[index_1    ] = v1[index_1 + 1] * v2[index_1 + 2] - v1[index_1 + 2] * v2[index_1 + 1]