ensure the primary user_id for all users is based on the id of their first workers user_id for consistency
util.php: Add function for gathering data on individual workers
util.php: new get_wherein_list_from_worker_data shortcut function
util.php: make worker functions more sensible
Rewrite hashrate graph code to support individual workers
Update hashrate functions to support mutliworker
Add multiworker support to contributor list
quick update to add worker_data
Fix undefined variables
update dygraph, fix graph colors
Fix broken areas of graph for new and removed workers
add APC caching to worker data