Embed data and vap in a zip file. Now that we have PWD, this will be straight-forward.
return true if the URI is only resolved on the local machine.
save the application, but embed data file resources within the zip, along with the .vap. The vap is saved with the name default.vap. When the data source contains a dataset that was created internally (with the Jython plot command, for example), it will be formatted as a QStream and embedded within the vap.