Cleanup (#820)

* Update instructions and readmes
* Cleanup in base files
* Cleanup in core files
* Cleanup in gui files
* Cleanup in dialog files
* Cleanup in tools files
* Cleanup in test files

nw/core/spellcheck.py

@@ -235,8 +235,7 @@ class FakeEnchant:
 class NWSpellSimple(NWSpellCheck):
     """Internal spell check tool that uses standard Python packages with
     no other external dependencies. This is the fallback spell checker
-    when no other is available. This method is fairly slow compared to
-    other implementations.
+    when no other is available. This method is slower than enchant.
     """
     theWords = set()