lui: allow direct access to EMC_STAT in lui object

Signed-off-by: Jeff Epler <jepler@unpythonic.net>
lui: switch shcom users to use lui for status buffer

Signed-off-by: Jeff Epler <jepler@unpythonic.net>
fixup lui: license declaration

Signed-off-by: Jeff Epler <jepler@unpythonic.net>
UIs: get rid of bogus serial number save/restore code

this looks like some hack around the "serial number doesn't really
work" bug, but for a long running UI like any of these it's useless.

if we really need something like this, we'll restore it down in the
lui layer

Signed-off-by: Jeff Epler <jepler@unpythonic.net>
UIs: get rid of updateStatus calls

.. converting the necessary ones to lui_status_nml_update, and
deleting the others

Signed-off-by: Jeff Epler <jepler@unpythonic.net>
lui-test: in case of specific failure, print diagnostic information

Signed-off-by: Jeff Epler <jepler@unpythonic.net>