intfbin/casa-listsdm: add missing exec bit
intfbin/msspwglue: untested fix for FLAG_ROW changing value issue

True indicates that the row is flagged, so it's no unreasonable to 'or' the
flags together. The dataset in question (jacksboro) has the first ~1/4 of
rows with FLAG_ROW=1, but this seem to be generally the case in the unglued
MSes. Seems scary?