Provide an option to choose whether state/province is displayed as full name or an abbreviation

Places that will be affected:

• standard search selector (state column)
• profile view (when State/Province field is included)

Schema contains necessary changes, USA and Canada are marked as countries that display abbreviation by default.

Basic idea to solve this issue is based on two tasks:
1. Make profile code check civicrm_country - is_province_abbreviated and display state/province accordingly
2. Make selector do the same, in addition to that, allow user to manipulate columns (which are displayed and which are not - state/province is not useful for most of users from "non-abbreviated" countries, but when full name of the province is displayed, it takes a lot of space in the selector)