Removed unnecessary search for node in bgi-application.

Todo:
-After speaking with jdhenke and oderby, reintegrate build-graph with analyze to make execution edges easy to maintain.
-Clean and test
Modified ps4 analyze to load graph and cfg code
Changed to call add-global-func if appropriate. Removed reference to cfg:get-root.
Fixed bug in bgi-sequence. Added convenience function for root node check.
Finished modifying analyze to add definition and call edges. Still need to add execution edges
Added print to analyze code. Currently asking for a 'node object' instead of string. Will wait for oderby to finish his fixes to the cfg lib.