[FEM] several Elmer fixes

- fix whitespace in the SIF writer
- Elmer GUI uses only 20 nonlinear iterations, so we should do the same (500 were also not sensible)
- don't restrict nonlinear-Newton iterations to 100, 500 might be necessary for turbulent flow
- update author

src/Mod/Fem/femsolver/elmer/equations/nonlinear.py

@@ -76,8 +76,8 @@ class Proxy(linear.Proxy):
             )
         )
 
-        obj.NonlinearIterations = (500, 1, int(1e6), 10)
-        obj.NonlinearNewtonAfterIterations = (3, 1, 100, 1)
+        obj.NonlinearIterations = (20, 1, int(1e6), 10)
+        obj.NonlinearNewtonAfterIterations = (3, 1, 500, 1)
         # for small numbers we must set an expression because we don't have a UI,
         # the user has to view and edit the tolerance via the property editor and
         # this does not yet allow to view and edit small numbers in scientific notation

src/Mod/Fem/femsolver/elmer/sifio.py

@@ -364,7 +364,7 @@ class _Writer(object):
                 attrType = _TYPE_VARIABLE
         if attrType is not _TYPE_VARIABLE:
             self._stream.write(attrType)
-        self._stream.write(_WHITESPACE)
+            self._stream.write(_WHITESPACE)
         output = self._preprocess(data, type(data))
         # in case of a variable the output must be without the quatoation marks
         if attrType is _TYPE_VARIABLE: