don't repeat field name if same as last, support format_name and

don't repeat field name if same as last, support format_name and
format_delimiter on field level if using iterate_by_page (without this, it's
really hard to get useful formating when using iterate_by_page), don't warn
on rare occasion (which is faulty import_xml definition, but anyway...) when
using append="1"

git-svn-id: file:///home/dpavlin/private/svn/webpac/trunk@195 13eb9ef6-21d5-0310-b721-a9d68796d827