Issues with ENV-variables override

[sreichel]

          Also did some tests ...

• not working if DB value exists
• Mage::getStoreConfig() does not work
• store config with overriden values should not have set "use default"
• store config with overriden values should be locked (to make it impossible to override ENV var with config)
• test fail for live data (rewritten tests to use installed OM)

Originally posted by @sreichel in #3863 (comment)

[sreichel]

@pquerner hey. Had you some time to review this?

[pquerner]

No. I'm currently loaded with other projects. Its best if the feature is disabled for now. (Its in a helper, and can be early returned)

I am thinking that I will have some time over the coming holidays / new year and will get back to you asap.

[sreichel]

Best X-mas wishes 🎄 :)