TargetPanel was modified in order to take variables out of the install definition (Target.dir.os)
A nice feature would be to allow modifying the target path within user panels called before the target panel. This is impossible right now
After investigation, I noticed that the code loading the variables out of the install.xml file is called through the constructor.
This is not safe, since calling an overidable method through a constructor can cause trouble in java (http://www.javapractices.com/topic/TopicAction.do?Id=215)*
This prevents the default install path to be reevaluated each time the panel is actually showed.
Instead, I propose to call that code through the panelActivated() method which was created for this purpose
I issued a patch with this issue. I tested the patch which works
created a user panel that let the user select some kind of "target environment" ie development or production
that panel is the first to be called
modified installer.xml so the TargetPanel.dir variable is using the variable defined in the first user panel
tested the installer, the default install directory changes as expected