Format generated message source code to adhere to Java indentation standards

Currently, the XSLT generating the quickfix.fix4x messages doesn't distinguish between inner classes and regular "outer" class when generating the getter/setter methods.

as a result, they are all indented the same way, making it harder to distinguish where a particular method lives.
See the thread for more info: http://www.nabble.com/QuoteRequest.set%28QuoteRequestType%29-and-various-other-set-methods-missing--tf3876614.html

Since the same XSLT template is used to generate getter/setter methods for outer and nested classes, it's not that easy to fix this in XSLT itself.

May be easier to fix it in the build directly, via a post-generation ANT task (something like Jalopy: http://jalopy.sourceforge.net/existing/plugin-ant.html).

Let me know if you know of any other code-formatting tools we can use instead, or if there may be a better way to achieve this, and i'll implement this in the build file.