Version Control With Subversion Source

* src/en/ch-server-configuration.xml:

- mention OSX keychain intergration
- more clearly delineate the ways to start svnserve
- explain how to run svnserve as native Windows Service
- reorganize 'extras' Apache section into clearer subsection
- document SVNListParentPath
- remind users to set svn:mime-type for better browsing
- document high-level logging feature
- lots of misc. cleanup & rewording