* Added some functions to help with reporting and getting account balances

* SupplierCreditNotes
- Return only open supplier credit notes by default
- Allow returning of 'open' and 'all' supplier credit notes
- Close creditnote apon full allocation of funds
- Implemented supplier credit note transactions
* SupplierReceipting
- Started work on supplier receipts module, this will preliminary only support generating a receipt against a supplier credit note
* Clients
- Added getClientGLAccountEntries

* Disabled caching ... pending better implementation, ipc shmem is left around after program exits and its damn slow
* Various cleanups and bug fixes
* More work on supplier credit notes

* Purchasing: API cleanup & fixes
* database schema: Cleanup
* Invoicing: API cleanup & fixes
* Tax: Improved API

* Added caching library
* Added first Engine function to get caching library stats

* GPL license update, downloaded from official site
* Updated license snippet at top of all files
* SOAP Modules are now called Plugins
* Started work on SOAP engine data caching
* New SOAP server config file format

* Updated database schema
* Return invoice "Paid" status when getting invoice information
* Renamed buildInvoice to sendInvoice
* Fixed bug in payments, where gl_accounts table was used instead of payments table

* Added preliminary support for payments to suppliers

* Finalized two types of addresses, shipping & billing
* Fixed various bugs regarding "Unit"'s
* Return tax reference in purchasing module
* Parse invoice item description
* Don't use database transactions if we don't need to
* Added invoice generation to admin interface

* Fixed discounts to work on supplier and client invoices
* Precision when calculating amounts that have decimals is set to 4
* Various comment fixups
* Fixed database representation of money types
* Quantity is now a number which can have 4 decimal places
* Fixed database transactions vs. AutoCommit, AutoCommit ON achives what we want
* Added "Discountable" hash entry to inventory items returned by Inventory module
* Added function "linkTransactionByRef" to GL module
* Various admin interface changes and fixups

* Added support for creating sub accounts for clients & suppliers in the relevant journals
* Various bug fixes
* Return more data when returning a GL account

* Revised GL accounts again

* Added contrib directory with books, this will contain sets of books which can be used as templates
* Added backend support for adding GL accounts
* Added support to admin interface to add GL accounts
* Lots of admin interface fixups and changes