Final revisions before debugging

1. index2.php uses updated cluster info (N=90 cluster from 6-cluster
k-means solution). yoked_data.csv also modified accordingly
2. added console logging of assigned/recovered condition and yoking info
3. forced non-skip of training removed in startExperiment.js, and
modified check_progress.php to recover training completion info so it
can be skipped if appropriate
4. added long delay after wrong answers (originally removed for
development purposes)
5. fixed progress bar to display actual target # of completes instead of
always 5
6. added detailed comments describing desired behavior of tutorial in
each condition
7. added get_yokeid.php and p101_database_connect.php