Updates Provider hack
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This hack lets you select the provider of updates for your Kindle
After installing, new directory called 'updates-provider' appears in user storage.
'providers' subdirectory contains files that illustrate all available options (amazon, hack).
Choose your provider and copy its file to 'updates-provider' root (or just create a file with proper name). Delete all other files.
Make sure you have only ONE file in the 'updates-provider' directory. Multiple files would confuse the switcher (in fact the files are alphabetically sorted and the last one (i.e. 'hack') wins).
If you specify something else than 'amazon' or 'hack', nothing will happen. After selecting your provider, reboot Kindle. New settings will be active after reboot.

This hack should survive update to firmware 3.1 and then enable installing/uninstalling hacks.
It does not interfere with jailbreak;

When this hack is active in firmware < 3.1 with jailbreak installed:
    - when the updates provider is set to 'amazon' you will be still able to install/uninstall any hacks as well as any official Amazon updates
    - when the updates provider is set to 'hack' you won't be able to install firmware updates from Amazon (manually or automatically), only hacks

When this hack is active in firmware 3.1 or in firmware < 3.1 with jailbreak uninstalled:
    - when the updates provider is set to 'amazon' you will be able to install official Amazon updates only
    - when the updates provider is set to 'hack' you won't be able to install firmware updates from Amazon (manually or automatically), only hacks

The default provider after installing is 'hack'
