Add new style for JITE

... JITE = Journal of Institutional and Theoretical Economics.

 * English style by German publisher
 * This style looks quite similar to the Chicago Manuals Style, but they don't mention anything in their style guide.
 * Update finanzarchiv.csl: Add pages in chapter/inproceeding (forgot before #1115)
I rather get rid of it.

I prefer our ISSNs to be as accurate as possible, and most signs point to the "0044-2550" ISSN having been superseded. See e.g. also http://library.usask.ca/find/ejournals/view.php?id=954925569823 ("Continues:	Zeitschrift für die gesamte Staatswissenschaft (0044-2550)").