[MERGE] Make value_switches=True the default for RegistryOption.

[Ian Clatworthy]

Ian Clatworthy has voted tweak.
Status is now: Semi-approved
Comment:
Keeping in mind that the current behaviour is assumed by existing 
plugins, this needs to be clearly documented in the CHANGES section of 
NEWS. Otherwise, this is OK by me.

For details, see: 
http://bundlebuggy.aaronbentley.com/request/%3C18438.32934.658094.752241%40gargle.gargle.HOWL%3E