Misc. typos

+ some are doxy others are just comment code.  
+ some minor whitespace and grammatical tweaks. 
+ app/SCL/* typos have also been submitted upstream (https://github.com/stepcode/stepcode/pull/366). So it's ok to merge them in to master.

src/Mod/Path/PathScripts/post/dumper_post.py

@@ -40,7 +40,7 @@ if open.__module__ == '__builtin__':
 
 
 def export(objectslist, filename,argstring):
-    output = '''(This ouput produced with the dump post processor)
+    output = '''(This output produced with the dump post processor)
 (Dump is useful for inspecting the raw commands in your paths)
 (but is not useful for driving machines.)
 (Consider setting a default postprocessor in your project or )