#1007466 by aspilicious, dereine: Provide a api function for adding complex queries: add_where_expression, add_having_condition.

#807616 by damz, dereine: Remove views_handler_sort_formula and add a short entry in api-upgrading.html

#667950 by merlinofchaos, bojanz and dereine: Revert the states patch and use ctools dependency instead.

931886 by bojanz: Remove views_handler_filter_float because numeric handler + dbtng does everything.