issue page for MP
Add info for an MPs most recent party

raw histogram-building information
Group histogram by stance text not raw value
Remove stances with no votes
Link to new person/issue pages

rather than to the generic ones
Tweak layout
move morph code into the helpers
New people.json with PW ids

Pull in the new people.json file with Public Whip ids from
voteit-data-pw
Display individual votes