Hi 

I've just uploaded a MemoryLayerSaver plugin to the contributed plugins on 
pyqgis.org.

This makes memory data provider layers (such as those generated by the contour 
plugin) persistant.  Each layer is saved alongside the project file in sqlite 
files.  When the project is reloaded the memory layer data gets repopulated as 
it was.  (Without the plugin the layer remains in the project, but all the data 
gets lost).

To use the plugin, simply install it.  Once installed all memory layers in all 
projects will be saved with the project, until you uninstall it again.

Cheers
Chris
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Thank you.
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