Tree copy as branching

Brilliant idea of Subversion

• a versioned tree filesystem
• svn cp -r 1034 http://svn.server/svn/trunk http://svn.server/svn/branches/1.0-releng
• svn cp http://svn.server/svn/branches/1.0-releng http://svn.server/svn/tags/1.0-release