remove illegal BT-7 and BT-8 from CII test files
01.01_comprehensive_test_uncefact.xml
01.03_comprehensive_test_uncefact.xml
01.04_comprehensive_test_uncefact.xml
02.01a_INVOICE_uncefact.xml
02.03a_INVOICE_uncefact.xml
02.04a_INVOICE_uncefact.xml
01.01_comprehensive_test_uncefact.xml
01.03_comprehensive_test_uncefact.xml
01.04_comprehensive_test_uncefact.xml
02.01a_INVOICE_uncefact.xml
02.03a_INVOICE_uncefact.xml
02.04a_INVOICE_uncefact.xml