Added invoice export function and started implementation of unitofwork pattern (#43)

* complete read invoices from db

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* updated nuget package spapi

* WIP

* wip, now test

* wip, jut need to fix tax inclusive line amounts not supported

* wip

* wip, before I f everything up

* no, it complies now, this is the one before I f everything up

* wip

* wip

* wip, logic ready for testing

* wip it builds!!!!

* wip tested, working, need to complete the gui section

* wip

* wip

* wip - created export invoice data delete, time for testing

* wip testing phase

* wip - delete function fully tested and working

* wip on to sorting out the issue with settlement invoices not tallying

* wip

* wip

* wip

* wip

* wip before I complete change the ReadInvoiceLineItem sections

* that appears to have worked, on with the main quest

* no it's doesn't work, saving before i remove the confusing cache system (just use a dictionary!!)

* wipping picadilli

* wip

* wip

* implemented uow on inovice export, now for testing

* wip

* wip all tested do invoice currency convertion fearure

* wip

* pretty much done so long as xero accepts the exported invoices

* Complete!

src/bnhtrade.Core/Logic/Account/GetTaxCodeInfo.cs

@@ -15,11 +15,6 @@ namespace bnhtrade.Core.Logic.Account
             dbRead = new Data.Database.Account.ReadTaxCode();
         }
 
-        public List<Model.Account.TaxCodeInfo> GetAllActive()
-        {
-            return dbRead.GetAllActive();
-        }
-
         public List<Model.Account.TaxCodeInfo> GetByTaxCode(List<string> taxCodeList)
         {
             return dbRead.GetByTaxCode(taxCodeList);
@@ -42,7 +37,7 @@ namespace bnhtrade.Core.Logic.Account
         /// Gets list of Tax Code Info for a given list of Sku Numbers
         /// </summary>
         /// <param name="skuNumberList">List of SKU numbers</param>
-        /// <returns>Dictionary, key is SkuNumber and value is Tax Code Info</returns>
+        /// <returns>Dictionary, key=SkuNumber and value=TaxCodeInfo</returns>
         public Dictionary<string, Model.Account.TaxCodeInfo> GetBySkuNumber(List<string> skuNumberList)
         {
             var returnList = new Dictionary<string, Model.Account.TaxCodeInfo>();