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* Various export enhancements and fixes, including:stuconnolly2010-08-121-0/+210
- A new SPExportFile class, providing an abstract interface to the handling and creation of export files. - Enables the centralisation of all file/file handle creation logic as well as better support for handling situations where files fail to be created, including files that already exist at the export location. - New SPExportFileHandleStatus constants to support the reporting of file handle creation. - Update SPExporter to use the new file class instead of directly using an instance of SPFileHandle. - Add the necessary logic to deal with files that already exist on disk, by providing the user with 3 options: cancel the export, ignore the files in question or overwrite them. We might want to enhance this to make new files sequential in name to prevent overwriting. Fixes issue #742. - New SPExportFileUtilities category, which centralises all the logic relating to writing export type headers as well as dealing with problems occurred during file/file handle creation. - Improve feedback given on the export progress sheet during export initialisation. - Tidy up and improve comments.