…1320. (#1321)

DBColAttr class>>#initialize is the only reference in code to the
database buffer classes, and so must not be stripped or the buffer classes
will be removed.

A new package closure test is included, but unfortunately the closure test
mechanism isn't sophisticated enough to catch this particular fault
because it only finds missing code caused by the calculation of the
transitive closure of packages required for an application. It does not
account for code removed by the deployment process that iteratively removes
(supposedly) unreferenced methods and classes, as this is difficult to
simulate. It looks possible to create a better test simulation using
RB environments than the simplistic approach currently employed, but it is
not easy, and in the meantime this corrects the particular case of the
apps using Database Connection not working after deployment.

…1328.

Ensure selection highlight shown immediately on rows with custom background colors. Resolves #1330.
Ensure tooltip cleared when list changes. Resolves #1331
Ensure tooltip cleared when columns change. Resolves #1332.

…ed text editors. Resolves #1333.

…, #1329, #1330, #1331, #1332 and #1333

Fixes #1337

Special columsn query working now, presumably due to a version upgrade