sponsored.js: Fix handling for 0 inventory values.
promotelinkform: remove cpm form input.
Add Location attribute to PromoCampaign.
Add VLocation validator.
Add locations to app_globals object.
Add LocationPromoMetrics.
Add inventory functions for geotargeting.
Add geotargeting for selfserve advertising.
get_campaigns_by_date: return dict with all srnames and dates.
Geotargeting is for sponsors only.
sponsored: Show campaign editor before filling it.