xls: improve record length checks.
t6515: don't test xlsx until we start implementing.

It's just noise at this point.
xls: fix export of conditional formats with super/sub script.
t6515: test more font attributes
GUI: Return FALSE in a focus-out handler.
gnmvalgrind: add gui suppressions too.
Borders: new leak printer at leak.
Border: improve cleanup.
Conditional format: plug leak in gui.