DOC: stubs for new modules

doc/fsl.wrappers.avwutils.rst

+``fsl.wrappers.avwutils``
+=========================
+
+.. automodule:: fsl.wrappers.avwutils
+    :members:
+    :undoc-members:
+    :show-inheritance:

doc/fsl.wrappers.bianca.rst

+``fsl.wrappers.bianca``
+=======================
+
+.. automodule:: fsl.wrappers.bianca
+    :members:
+    :undoc-members:
+    :show-inheritance:

doc/fsl.wrappers.rst

@@ -4,7 +4,9 @@
 .. toctree::
    :hidden:
 
+   fsl.wrappers.avwutils
    fsl.wrappers.bet
+   fsl.wrappers.bianca
    fsl.wrappers.eddy
    fsl.wrappers.epi_reg
    fsl.wrappers.fast