rename script to omit the .py extension

this is in line with the other tools, and it allows us to use a sane
copyright header.

Revert "Add a proper license header qdoc-bot"

This reverts commit 30a8d896

.

Change-Id: I2ef4c1cde7fb2ca6ccbe2a8f84b3cb99c47a653c
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>