Added History to Item Edit form on Vendors and Customers tabs

To view additional information about Items on the Customers and Vendors tabs go to:

Items → Item edit form → Customers

After clicking on any field with Price value the Customer Price History Panel (the same to the panel Customers → Customer edit form → Items → Price value) is opened 

1. 1. 1. the panel displays the list of Invoices corresponded to the Item
      2. Invoices are grouped by Current Customer and by the other Customer

Items → Item edit form → Vendors

After clicking on any field with Last Cost value the Vendor Cost History Panel (the same to the panel Vendors → Vendor edit form → Items → Last cost value) is opened 

1. 1. 1. the panel displays the list of Bills and POs corresponded to the Item
      2. Bills and POs are grouped by Current Vendor and by the other Vendors