Rework intructor form
Rework intructor form

1. Drop input for number of wanted instructors (the new assumption is
   that matchmaker wants to look through all our instructors, based on
   some specific sorting)
2. Drop for loop for adding lessons to the form
3. Instead use lessons field (displayed as multiple checkbox widgets)
4. Add input for country
5. Simplify layout (to be easily used in vertical form, in a sidebar)
6. Simplify logic for using either airport, or lat/long, or country.

pbanaszkiewicz/amy,swcarpentry/amy,pbanaszkiewicz/amy,wking/swc-amy,vahtras/amy,pbanaszkiewicz/amy,wking/swc-amy,swcarpentry/amy,wking/swc-amy,vahtras/amy,vahtras/amy,swcarpentry/amy,wking/swc-amy