addonHandler.createAddonbundleFromPath: Use zipfile.ZIPFILE_DEFLATED to open the Zipfile object to actualy compress bundle contents. The default only stores data with no compression. Minor correction to addonHandler.AddonManifest to make this function not throw errors when manifest is valid.
Note: addonHandler.createAddonBundleFromPath is not directly used by NVDA however may be a fast way to create addon packages from the console or automated build infrastructures.