Configure script won't allow build directory to be under source

Users that are not familiar with the file structure of the project may
specify the current directory (to-level source directory) as their
build-directory. This will cause a crash right after answering the
questions, where `rm' will complain about `tex/build' not being deleted
because it exists as a directory.

To avoid such confusing situtations, the configure script now checks if the
build directory is actually a sub-directory of the source. If it is, it
will complain with a short message and abort. Also, a `CAUTION' statment
has been put in the initial description, right ontop of the question.

This bug was reported Carlos Allende Prieto and David Valls-Gabaud.

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