UPGRADE TO 2.4.0

This version of PC Builder fixes a bug in the builder front-end; when products are
selected and then deselected they still show up in the shopping cart - I've only
managed to get it working for individualy deselected components.

The main purpose for releasing this version is the addition of a dependencies matrix, which
makes defining and maintaining individual product dependencies much easier.

NB: This is not a full package !!

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