Wait for response from from displayed windows when saving plots to file
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karlmsmith commented
The FRAME command just issues the save plot command to displayed windows then proceeds on. This may cause problems if the user is expecting the image file to exist and be complete in subsequent commands. The main process should wait for a response from the displayed window process. This will ensure the image file is complete on return of the command, or an error will be displayed before proceeding if there was a problem. This wait-for-a-response code can also be used for the WHERE command (issue #11)