Add a script for generating hansard statistics for Jessica

Fixes #1160.  This was a one-off request, but probably worth
committing to the repository in case we need to regenerate these
in the future.  This is a very slow and inefficient script - however,
this seems like a case where trading off speed of development against
speed of execution is reasonable.
The Women's representatives are Members of the National Assembly

... so don't count them separately, even though their association
with places is different from constituency members of the NA.