Fixing issue #208
Fixes #221, Fixes #222

Prevents a user from adding identically-named participants
Changing text for navigate away from survey issue #208
Height and weight no longer change on each tab fixes issue #220
Checking in default text value clearing, fixes issue #207
Checking in changes so that select boxes have the right values
Merge pull request #218 from meganap/agut_issue_208

Fixing issue #208
Merge pull request #223 from adamrp/issue_221_222

Fixes #221, Fixes #222
Merge pull request #225 from meganap/agut_issue_220

Height and weight no longer change on each tab fixes issue #220
Merge pull request #226 from meganap/agut_issue_207

Checking in default text value clearing, fixes issue #207