MAGIC files won't find subcells when reading from command line

[klayoutmatthias]

MAGIC file read well when using the "File/Open" menu, but when using them on KLayout's command line, the subcells will not be found.

[klayoutmatthias]

Seems to be fixed on 0.26.9.

[klayoutmatthias]

It easy to reproduce if you specify a file without a path and when the current directory is where this file is.

[klayoutmatthias]

PR #694 will fix this issue.