Version Control With Subversion Source

* en/book/ch01-fundamental-concepts.xml.
(svn.basic.in-action.wc): Removed the tip about SVN_ASP_DOT_NET_HACK
(_svn dirs instead of .svn). Is there any reason to keep it in
SVNBook 1.8? The hack was required for VS.NET 2002 and it looks like
it's not that actual anymore in year 2016.