Remove heliosverifier
Remove helios tests
Cleanup helios/views

part 1
Update zeus tests
Refactored most of the helios workflow within zeus module
Update translations
Remove print statements
rename obsolete ADMIN_MEDIA_URL -> STATIC_URL
make some translations
fix get_db_prep_value connection argument error
fix list_elections to handle polls
list_elections command to support polls
list_voter_urls to support polls
update zeus client for polls
Remove debug print statement
Reraise mixing error

in order for mix_error poll field to be updated
Reset error field on task success completion
Proper task call

combine_decryption task is removed
Fix election public computation on trustee deletion

avoid counting trustee as a deleted trustee
Update texts and translations