Restore voting information to MP profiles page

This was removed in the bulk commit eae4f32ad101e271fb5d1581159dfcb0086caabf
Update rebellion calculation to be the same as TWFY

It was changed in this commit upstream: https://github.com/mysociety/theyworkforyou/commit/edb0c6f9bd7ad2b57f9befee42d45c9059d01bb1
Re-enable loading Public Whip data. NOTE: Requires new config variable

Originally disabled in 371ec87d80f54b59aaf9399d2e878851fe56b283

Made the URL configurable so that we can point it at the Aussie version
or your development environment.
Re-enable display of voting issues table
Use configurable Public Whip URL
Remove UK voting issues and replace with a couple of examples
Remove link to speeches

The UK doesn't have it any more and I can see why. You'd probably be
sent off to a page with a bunch of irrelevant speeches
Enable some more examples for testing
Disable unused "Committees and topics of interest" section
Use configurable URL
Emable loading of example policies from the Public Whip
Revert "Tweaked help page contents and fixed a few absolute links"

This partially reverts commit 093ea993098cc63cccb751e8493614dcb0061e76

Restores voting record help section
Change Peer => Senator
Remove part about party whips

I'm not sure this is true for Australia and I don't think it adds much
value to the help message for us so I'm just removing it.
Remove UK specific section about a FOI bill in their parliament
Make Public Whip host configurable in remaining places
Load every policy our awesome political researchers have created
The researchers have done 33 policies now
Use the researchers' policy descriptions for now
Remove extra space