WebReports customer extensions

This folder holds independently installed customer extension packages.
Standard WebReports releases do not include customer packages or entitlements.
Preserve installed extension subfolders when updating WebReports.

The WebReports application account needs read/execute access to installed packages.
Marketplace deployment additionally requires write/delete access to the configured
extension, staging, and archive folders. An administrator can deploy packages when
the application account does not have those permissions.
