[Bf-taskforce25] Warning: don't expect 2.50 saved .blends to read atm

[Ton Roosendaal]

Hi,

I'm bringing back basic code for reading/converting all editors 
(SpaceData). Previously most of these were ignored... first thing I do 
is a sane reading of pre-2.5 files.  It is well possible older 2.5 
files (or current ones) don't read well.

Making a version patch for the current state of 2.5 is not very useful 
imho... :)

-Ton-

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Ton Roosendaal  Blender Foundation   ton at blender.org    www.blender.org
Blender Institute BV  Entrepotdok 57A  1018AD Amsterdam The Netherlands