[Version Control] SVN 1.7 - Improved checking of directory entries.
[Version Control] Actually allocate pools.
[Version Control] Subversion - Only use static GetDirectoryDotSvn if 1.6.

Check for pre_1.7 is done in Unix Svn and there's no overload in Win32 1.6.
[Version Control] Fixed faulty Svn directory finding
Fixed up something that shouldn't have been committed.
Merge pull request #343 from mono/svn17Dot

Fixed Subversion 1.7 Root Directory Finding