[development] Cascading variable system

[Robert Douglass]

I like this system and perhaps we could solve an old gripe that I have 
about our current variables; that many variables never get initialized 
but rather remain undocumented 'features' of the code. IMO, it is bad 
form if you have variable_get('foo', 'baz') and can't find variable 
'foo' in the database. All vars should get initialized.

-Robert


Adrian Rossouw wrote:
> During initialisation, every module / system has the opportunity to 
> load it's variables into the tree. For example :