Naming of working copy administrative directories
	  =================================================

Description:
============
Allow use of an alternate name for Subversion working copy
administrative directories on Windows (which were formerly always
named ".svn"), by setting the SVN_ASP_DOT_NET_HACK environment variable.
When the variable is set (to any value), the administrative directory
will be "_svn" instead of ".svn".


Use case:
=========
This is a hack to work around unnecessarily restrictive behavior of
ASP.NET on Windows which prevents access to directories beginning with
a dot.


Notes:
======
Once the environment variable is set, normal working copies with
".svn" directories will stop working, and will need to be
re-checked-out.

This hack prevents sharing of working copies between Windows and other
operating systems (e.g. over network mounts).

Thread for more details:
http://subversion.tigris.org/servlets/ReadMsg?list=dev&msgNo=105810


Implementation:
===============
Setting the SVN_ASP_DOT_NET_HACK environment variable only works on
Windows, and only with the svn and svnversion binaries, and the
language bindings.  It doesn't work for the core C libraries
themselves; users of the libraries must call the new,
platform-independent APIs introduced with Subversion 1.3.0 to take
advantage of this work-around:

o svn_wc_is_adm_dir()
o svn_wc_get_adm_dir()
o svn_wc_set_adm_dir() - restricts the list of allowed names to .svn and _svn