In Gaussian LoadGeometry search for standard orientation

instead of the input orientation.
The input orientation isn't being printed by default for molecules with
more than 50 atoms (can be overriten using `iop(2/9=2000)`). Besides,
the standard orientation is more representative of a molecule, if that
is of any value in our context.

arkane/gaussian.py

@@ -128,9 +128,10 @@ def loadGeometry(self):
         line = f.readline()
         while line != '':
             # Automatically determine the number of atoms
-            if 'Input orientation:' in line:
+            if 'Standard orientation' in line:
                 number, coord = [], []
-                for i in range(5): line = f.readline()
+                for i in range(5):
+                    line = f.readline()
                 while '---------------------------------------------------------------------' not in line:
                     data = line.split()
                     number.append(int(data[1]))