index-metadata, lowercasing field names?

[Markus Jelsma]

Hi,

I've got metadata, containing a capital in the field name. But index-metadata 
lowercases its field names:
  parseFieldnames.put(metatag.toLowerCase(Locale.ROOT), metatag);

This means index-metadata is useless if your metadata fields contain uppercase 
characters. Was this done for a reason?

If not, i'll patch it up.

Thanks,
Markus