hanging execution in webtests which use websockets

[toschneck]

Currently the open source version of Sahi won't support webpages with websocket usage. In our case it was the sock.js library. The effect currently is, that webpages are "hanging" and just execute the next web test action from time to time, see Sahi Community: Errors with websockets.
Due to the release notes of Sahi Pro v6.1 there earlier version have a problem with correct handling of websocket connections.

If the free Sahi Pro Starter is used, the test works well. Also the Selenium extension in #247 didn't have any Problem
TODO:

• Add a hint in the documentation.
• Open Issue for supporting Sahi Pro Starer as alternative due to the current Sahi OS version.

intellij_patch_sakuli_src_changes_first_try.patch.zip