Trim trailing spaces from mpinfoin.pl script.
Remove old WIP policy codes from mpinfoin.pl
Ensure mpinfoin.pl includes all current policy codes.
Add new policy position on war.

Closes #430.
New policy position on tax avoidance.

Closes #432
New policy position on academy schools

Closes #418
New policy position on same sex marriage

Closes #417
New policy position on state ownership of English forests

Closes #440
New policy position on Police and Crime Commissioners

Closes #439
New policy position on taxes on alcoholic drinks

Closes #438
New policy position on tax incentives for companies to reinvest

Closes #437
New policy position on civil service redundancy payments

Closes #423
New policy position on changes to council tax support

Closes #422
New policy position on local retention of business rates

Closes #421
New policy position on abolition of Education Maintenance Allowance

Closes #419
Wording change to smoking ban policy position

Closes #420