Version Control With Subversion Source

'svnadmin create' is documented.

* doc/book/book/ch05.xml: in repository creation section, add giant
WARNING sidebar about avoiding network shares. I'm sooooooo sick of
people not seeing the FAQ and getting burned by this.

* doc/book/TODO: tweak note.

* README: rewrite ancient section (it makes it sound like apache is the
only possible server process), and add giant WARNING about avoiding
network shares.