CoW, a Controllable Wiki Code

Added an option to use native "ssh" for svn+ssh

By default there is a special case in svnkit whereby svn+ssh URLs are handled
using the pure-Java trilead SSH client. Other tunnel protocols
(svn+somethingelse) that are defined in the config file are properly respected,
but this does not apply for svn+ssh - an "ssh = ..." tunnel definition is
ignored in favour of trilead. This commit makes it possible to change that
behaviour by a configuration option gate.cow.useNativeSSH=true in cowrc.groovy
which removes the special case and makes it so that svn+ssh URLs will use the
"ssh = ..." tunnel specification in the svnconfig file. Note that this has a
couple of important caveats:

1. there is no default definition for svn+ssh like there is for the command
line svn client - you *must* define "ssh" as an explicit tunnel type in your
svnconfig for this to work
2. using a native tunnel for ssh means that authentication data (username,
password and/or SSH key) defined on the Wiki object does not apply - if
connections will not authenticate with the default ~/.ssh/id_* keys then the
tunnel specification in svnconfig must include the relevant "-i" and "-l"
options. The username from auth data will be passed as the tunnel-user
option to the remote svnserve but will not affect the SSH connection
username.

Added patched version of one internal svnkit class that was causing failures when talking to https repositories using the BouncyCastle TLS implementation.

CoW upload

PageService.deleteFiles called by user xsong

[xsong] PS.createDirectory

[xsong] PS.createDirectory

Removed unused import which prevented the plugin compiling in Grails 2.5

Fixed up the "two digits" check so it doesn't also prevent you using symbols in a password

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