Prefix non-portable kwargs with ex_, and move utillity functions to have a _ prefix, so they are considered 'more private' in python.
Prefix non-portable kwargs with ex_, and move utillity functions to have a _ prefix, so they are considered 'more private' in python.

git-svn-id: 353d90d4d8d13dcb4e0402680a9155a727f61a5a@941058 13f79535-47bb-0310-9956-ffa450edef68

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