Revert "Fixed suffixes in localized date formatting."

This reverts commit 75bf75537f691795cc54fbfa3348002f610235e9.
Fixed locale files for textual dates.

This fix is needed for date ranges to appear in the form
1.-2. Marts.  The period is the ordinal form, not a suffix.
See #12.

Changed the following locales (every one that had ". " as suffix):
cs-CZ, da-DK, de-AT, de-CH, de-DE, et-EE, fi-FI, is-IS, nb-NO.

Together with the reversion of the earlier fix to #12,
this closes #18.
test-pandoc-citeproc: Test executable rather than library function.

Also, set locale before running executable.
Closes #19.
Support new langid and langidopts bibtex fields.

Closes #11.