small improvement to commandline completion to support filenames
(1) change handling of new attribute xml:
no longer try to convert to an assoc array, and just parse the xml properly
(2) add support for ezselection attribute type
(3) comment out partial support for ezmatrix attribute type

NOTE: THIS INTRODUCES A BC BREAK IN THE ATTRIBUTE XML FILE FORMAT. If you
attribute updates across this version, the update will crash (without
damaging the database).
Merge branch 'master' of github.com:mugoweb/eep