Feature: Select existing or add new software when creating a testing enviroment

[marisademeglio]

Will help prevent duplicates

[marisademeglio]

The current testing environment creation form shows a drop down of existing, or the option to add a new one. But the process to add a new one does not include (enough) redundancy checks. Better would be a search-as-you-type or select from a list, on the same page.