BT: multiple bugfixes with import/export of properties in a separate files
The branch is a good state for me and it can be merged. But there's still further work to do:
- Reexport all BT to rename files with better extensions.
- Using only the class name is not reliable enough. We need something better.
- For File/Image, I'd like to get rid off the
_EtagSupport__etag&sizeproperties. File._setData contains exactly the need code to restore the object. It would also solve the issue that big strings are currently not reimported asPdata(OFS.Image).