Fixed ZCatalog constructors - there was a problem with the default argument for vocad_id that broke new catalogs.

Fixed two bugs in tutorial examples - the sample mail host is now editable, and the gadfly database setup method should now work regardless of whether a gadfly connection has been previously created.

Fixed the HTML of the ZSQL Methods 'Test' tab. Now there is an HTML doctype and the HTML and BODY tags are correct. This should probably be moved out of the code into a HTMLFile.

they already exist.

retained in tarballs.

fixing a bug that made the management tabs disappear for some
property sheets involving ZClasses.

such as PropertySheets, are traversable but are not Items.

Thanks to Gisle Aas.