goffice 0.10.21: Jean: * Ignore invalid values while checking data order. [#744200] * Ensure that GOPixbuf keeps the original data around. [#745297] * Fix sheet objects rendering, including widgets. [#744076] Morten: * Fix problem with linear solver. * Add arrow selector widget. * Fix rendering of dotted lines. [#744419] * Activate font part of graph theming. * Plug leaks. * Add tooltips to gradient selector. * Add tooltips to pattern selector. * GOImage fixes. --------------------------------------------------------------------------