[ESS] bug: exclude version control stuff for stable versions

[Patrick Drechsler]

Hi,

trying to update to ess version 5.3.8 and including it in "mysitelisp"
worked fine.  Until I updated my version control repository..

REQUEST: PLEASE refrain from including .svn directories (or other VC
stuff such as .git, .hg, etc) in official RELEASES. The VC stuff is fine
in development.

Cheers,

Patrick