Merge pull request #45 from aglos/Ohad's-branch

Ohad's branch
change class static db to be really static!!! :D:D:D
set vars names to be logical
create functions get_circles_years & get_circles_years_as_string
return int/string of years sorted
years filter
filter by years show specific circles in year - need to change circle id
in option list to real id!!
in checker page:
-all options list values is the actual id of the course/circle!!!