Fixes #2456 and new Add Reagent varedit option.

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 a new add_reagents_list proc for when you want to add a lot of reagents.
Made create_reagents delete() any existing reagents, to help avoid memory leaks.