tabs->spaces (it had to be done...)

also, commit b09ab06c2db2961460e5309a01ba795d572c7413 touched a lot in
this file but wasn't properly documented.  specifically what changed in
this file was:
 - bibtex logo prints, thanks to dtklogos
 - section titles shortened so all sections fit on sidebar
 - some speaker notes added
 - credits slide overhauled a bit