Ability to Copy folders recursively

Imported From: http://groups.google.com/group/in-portal-dev/browse_thread/thread/c16a335ceb07f5a8#

Hi guys,

I have came across a need to be able to COPY some files and folders
recursively during the installation script (when Application is already
available). For that I decided that it's good to have a more common
functionality that can be used by others in PHP code.

The best place to implement this is was a FileHelper class which I used.

Note that this task is derived from the need to be able to copy over Theme
Demo files during In-Portal installation if user selects to install theme
Demo data.

Separate task created for this (patch attached here for review):

967: Ability to Copy folders recursively

DA