clearify deltaG and deltaGErrs

[nconrad]

I've been meaning to do this. Should show “unknown” or “unspecified” for deltaG and deltaGErr's that are “1000000".

Reported by @chian.

[amikaili]

New MODELSEED-UI production code has been released, and tagged 'v2.0', in the 'master' branch. GitHub is no longer used for bug tracking, though. Please send an email to help@modelseed.org, with the subject MODELSEED-43. The email server will post the email as a comment to the MODELSEED-43 ticket, in Jira.