Added subrequirement view and updating
Cool sliding animations!
Requirements can check if they have an ancestor/are an ancestor to another requirement
Finished subrequirement GUI
Merged work
Fixed issues with saving updated subrequirements.
Modified positioning of requirements table
Added a function to get total estimate (children included)
Disabled add existing and add new buttons when parent is deleted or complete.  Made it so children can be edited from their parent
Made it so that the EditPanel is refreshed when a child is added
Added total estimate to GUI
Merged code in for total estimate
Polished bug that would allow add existing button to sometimes be active when it shouldn't be once a child is removed or added
Merged subrequirement into developer