Added new Subtract Whole Query tool. Also some miscellaneous code clean-up.

tools/data_source/upload_code.py

@@ -1,11 +0,0 @@
-#Provides Upload tool with access to list of available builds
-import galaxy.util
-builds = []
-
-#Read build names and keys from galaxy.util
-for dbkey, build_name in galaxy.util.dbnames:
-    builds.append((build_name,dbkey,False))
-
-#Return available builds
-def get_available_builds():
-    return builds