Fixes #2456 by moving the code which transfers the reagents to ready_proj()
Removed excluded obsolete files.
Adds a new option to view variables which allows you to add reagents, useful for debugging reagents.
Added add_reagent_list, a useful proc if you want to add a lot of reagents from a list.
Make create_reagents delete() any existing reagents, to help avoid memory leaks.
Merge pull request #2457 from Giacom/dart_fix

Fixes #2456 and new Add Reagent varedit option.