add user_line services
remove nb_row_affected from associate user_line
add missing unittests
remove duplicate test
remove unused check validator
add missing unittests
let the model to control main_user/main_line value
fix unittests
add missing unittests
rename function in user_line dao
add missing test cases into unittests
fix grammar in error messages
rename find_main_user to find_main_user_line
fix pep8 warnings
rename function in services
fix tests for multiuser scenarios
fix test name
fix pep8 warnings
fix test that didn't test the right thing
Merge branch 'user_line'