collapse_element stub implemented; builds
Test stub implemented; passes nosetest
Identify comps to collapse
Pre-cleanup: passes nosetest
Mostly cleaned up; more testing to to do
More cleanup
Implement exception zlist; 20 lines -> 10 lines
Update header doc
Use id function to create nucid from znum
Update code doc
fix name of item; add test stub
Use and test stripped nucids instead of znum
Minor doc update