[IMP][website_forum] forum improvements

Task: https://www.odoo.com/web#id=10387&view_type=form&model=project.task&action=333&active_id=131
Pad: https://pad.odoo.com/p/openerp-project.task-MAKW3FS9Y3

[IMP][website_forum] improved logic for posting links in forum + generated karma list dynamically
[IMP][website_forum] enabled edit feature for links, added char pager for tags
[IMP][website_forum] solved blog's css conflict
[FIX][website_forum] added login redirection in ask questions
[IMP][wenbsite_forum] improved help for relevancey formula
[FIX][website_forum] solved counter problem for vote & solved mysterious view counter problem (generated because of survey)
Should not put template stuff in model. here you written template stuff in default.

but you should take content from template using read method and set this content as a default.