Guile examples directory and box examples

[Mike Gran]

Hello Guile-

It has been a long time since I noticed the existence of the examples
directory in the Guile source.  Looking at it, I wonder if it is
worth keeping.

Aside from typo and copyright fixes, it has been unmodified since
the (web http) example from 2011.

The box examples do not really demonstrate current best practice.
Also, I have some doubt that users are looking at that code
for inspiration, rather than what online sources provide.

It uses "make installcheck", which is uncommon.

Regards,
Mike Gran