Add booth-wise elector count (extracted from roll PDFs)

Booth-wise elector count (male/female/other/total) based on a quick-hack automated extraction from electoral roll PDFs. Some states and UTs are missing, notably:

Uttarakhand - PDF rolls not available
Chhattisgarh - PDFs rolls behind captcha
Lakshadweep - problem with parsing
Chandigarh - problem with parsing