rename 'new' to 'create' to avoid reserved word collision with C++ add

[Linas Vepstas]

Log Message:
-----------
rename 'new' to 'create' to avoid reserved word collision with C++
add 'version_compare' function for sql backedn updates

Modified Files:
--------------
    gnucash/src/business/business-core:
        gncBillTerm.c
        gncCustomer.c
        gncEmployee.c
        gncEntry.c
        gncInvoice.c
        gncJob.c
        gncOrder.c
        gncTaxTable.c
        gncVendor.c