MT#5879 Invoice generation fixes.

Use correct name for zone fees cost.
Fix condition for char column in script.
Add root element to xml before XPath parsing to avoid errors about
the same elements on root level.
Set timezone to local. Maybe it shouldn't be, but then should be changed
in both used methods.

Todo:
Country name for generation from web.
Clarify and implement if neccessary generation of existing invoice from web.
Now invoice for the same period created.