Revert "Updated IBM DB2 and Informix data provider binaries to version 9.7.5.2 (19.10.2011)."

This reverts commit 844df3ea55bd74625115edc3991e304801c411db.
Updated Oracle data provider.
Support for queries to implicit interface-implemented properties
Tried to reproduce http://www.rsdn.ru/forum/prj.rfd/5089026.1 (without success) and found an issue with nullable types
Merge branch 'master' of https://github.com/igor-tkachev/bltoolkit.git
fix for http://www.rsdn.ru/forum/prj.rfd/5089026.1
Merge branch 'pr/n181_MaceWindu'
Fixed formatting.
Merge branch 'pr/n181_MaceWindu'
Additional case of mapping to explicit interface implementation
Fixed formatting.
Merge branch 'pr/n183_MaceWindu'
Merge branch 'master' of https://github.com/igor-tkachev/bltoolkit

Conflicts:
	DataProviders/Oracle/BLToolkit.Data.DataProvider.Oracle.4.csproj
	Source/Data/Linq/Builder/ExpressionBuilder.SqlBuilder.cs
	UnitTests/Linq/App.config