Release 4.03RC1

This release has the new fixed assets work and is a step change towards fully remerged with Tim Schofield's launchpad and other sourceforge project. A further release will be required to build Tim's upgrade mechanism into this project's code base.
There has been much work on the purchase order system mostly under the hood readability and efficiency imrpovement work - reducing round trips to the database and removing abstraction where possible to improve code readability. Now purchase order quantities are only ever stored in the units of measure of the business.

Some problems existed with the first release candidate which required significant rework of fixed assets - this has all been redone in this release. All users of 4.0RC1 should upgrade immediately.