yams #57297 missing .bat files breaks windows install [validation pending]

Dr Leo reported:

Processing the build scripts yams-check and yams-view on Windows requires these files to be named yams-check.bat. Don't know why they have no .py file extension. Here, they have just no extension. Writing corresponding .bat files with a single line "python yams-check" and "python yams-view" helps. yams is now installed and I have just successfully imported cubicweb, however ugly the .bat files may be.

done in0.30.3
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