Corrected autocompletion for adding parameters. Added functional test to verify.
Merge pull request #1442 from crobinsonut/fix-parameters-autocomplete

Fixed autocomplete when adding parameters
In dev-guide, fixed bad link to Xcode downloads.
Merge pull request #1443 from pziegfeld/xcode_link

In dev-guide, fixed bad link to Xcode downloads.
Merge branch 'dev' into gui