Developer Guide samples should set up the required WebLayout

[jng]

The current Developer Guide samples require manually loading their associated packages first in order to function.

But if you look at what is actually inside these packages, it is just a WebLayout document, which we can easily load in ourselves through code.

Doing it this way, we can do away with needing to load packages and it also demonstrates loading dynamic WebLayout documents.

[jng]

Fixed r6777, r6778, r6779 and r6780