fix cdm checkbox not selecting entire cell
headlines buffer: remove dijit-based RCHK elements
Revert "headlines buffer: remove dijit-based RCHK elements"

This reverts commit f7945c99d0495f5b2e0e789d99e32b1e121ae1cf.
remove headline precaching stuff, conflicts with dijit widgets in
headlines buffer
only use hash feed/cat parameters on startup