Issue #933: Allow wb.active to be set to a sheet or a sheet name as well as sheet index
Created originally on Bitbucket by zeripath (Andrew Thornton)
Changesets for this Pull Request have not been imported, because it had been already declined on Bitbucket. Marked as closed by the import user.
This pull-request implements the feature request in issue #933 (closed) whilst still allowing active sheet to be set by index