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Exporting GDS with magic - I'm seeing this error: `Calma output error:  Structure name not found at GDS file position 624670`

replicate by running update_gds in the ./mag directory of this repo: <https://github.com/mattvenn/tt06-analog-relax-osc>

my fault - it was a cell I'd copied from another project and now didn't match the PDK

by updating the cell with one from the enabled PDK this issue went away

One must be careful when using cells that have `GDS_FILE` defined as a property.  In effect, you are then looking at an "abstract cell".  The GDS comes from the file referenced by the `GDS_FILE` property, and that file had better exist, and it had better not be modified either without regenerating the layout view.  It's a rather fragile system, admittedly.  The alternative is to keep the GDS locally, which would cause file sizes to blow up, but maybe that's the way I should have done it.