SHC PC Utility for ER-260

Added "Non Tax" option into "Taxable by" field in Department and PLU Programming
Therefor the taxable by can be changed to non-tax if needed.
Descriptor of DEPT/PLU is/are downloaded together with DEPT/PLU

PC Utility for ER-260/265 has other functions called DEPT Desc./PLU Desc. below,
for sending DESCRIPTORs Only. DEPT/PLU downloads ONLY price and status.