Subversion path changes

After a fair bit of internal debate, we’ve settled on a new
repository layout. It’s not ideal, but I’m not sure we’ll get an ideal
solution until subversion supports native symlinks. With this solution,
when an RT release hits a version bump, you’ll need to execute a simple
’svn switch’ command to move your checkout to the “new branch.” Once
subversion has a release that supports native symlinks, we should be
able to relieve the need for the “svn switch”

[Repository Layout]

/rt/README.LAYOUT        # this document ;)

/rt/2.0-MAINT
/rt/3.0-MAINT
/rt/3.2-RELEASE
    `==> /rt/tags/3.2.0
    -> /rt/3.2-MAINT   
    `==> /rt/tags/3.2.23
/rt/3.3-TESTING
    -> /rt/3.4-RELEASE
    -> /rt/3.4-MAINT
/rt/PLATANO-EXPERIMENTAL
    -> /rt/3.5-TESTING
    -> /rt/3.6-RELEASE
    -> /rt/3.6-MAINT
/rt/RUTROH-EXPERIMENTAL 
    -> /rt/3.99-TESTING 
    -> /rt/4.0-RELEASE
    -> /rt/4.0-MAINT

Level tags:
EXPERIMENTAL: Revision-numbered snaps. Codename based labels.
- Not to be relied upon
- Has all the latest cool features, which may not make it into a
release.
TESTING: Odd minor version
- Featureset slush.
- Recommended for new development and test deployments
RELEASE: Even minor version number
- All bugfixes, minor features.
- NO SCHEMA CHANGES.
- Loc-string changes discouraged.
- Recommended for production deployment.
MAINT: Even minor version number; always older than the current RELEASE
- only critical bugfixes. No loc-string changes unless critical.
- Supported by Best Practical.
- Not for new installations.