Revert "last bit of XPathNodeIterator MoveNext() fixes are there any tests?"

This reverts commit 3265304b2758d9e20e9df6f879d8159c0a293909.
* GlobalSettings.cs: dbdsn hook for configuration manager service

* Umbraco.Core.csproj: Added a configuration manager service

* PublishMediaStoreTests.cs: Added assert for not null

* TestHelper.cs: set-up test helper to work with MySqlTestHelper

* Umbraco.Tests.csproj: switch to Mysql

* umbraco.datalayer.csproj: added MySqlTestHelper.cs

* dummy.txt: renamed to masterpages