Add support for chapbooks at title level

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You should see Bug 1892421 'Chapterbook Titles Can Be Created' - It appears You and Ahasuerus need to figure out the correct direction for this issue. - Kpulliam - Anonymously cause I was lazy

I favor full support for a chapbook type, or something simialr type. i also favor renaming it, perhaps to "Short work" or "Short Pub" which should cover all the various uses we would want to make of it.

-DES

Submitted changes to reenable Chapterbook support, on the way to SHORTWORK/BOOK support. For now: allow CHAPTERBOOK contents and title types, hide CHAPTERBOOK contents for CHAPTERBOOK publications, etc. Renaming can come later.

Affected modules: biblio/pl.py v1.10 , edit/editpub.py v1.5, edit/edittitle.py v1.4, edit/isfdblib.py v1.5, edit/rmtitles.py v1.3

Existing CHAPTERBOOK titles are not listed in Chronological (http://www.isfdb.org/cgi-bin/ch.cgi?Nette%20Hilton) nor in Alphabetical (http://www.isfdb.org/cgi-bin/ae.cgi?Nette%20Hilton) bibliographies - biblio/ch.py, biblio/ae.py

Also, CHAPTERBOOK-only series are not displayed in the Summary bibliography (but if a CHAPTERBOOK is added to a series containing NOVEL titles, it is displayed as part of the series and not in the Chapterbooks section).

Partially implemented in r2009-05 -- see Bill's comments from 2009-06-20 19:25. We still need to change "CHAPTERBOOK" to "Chapbooks" or "Shortwork" and decide how we want them to behave.

Implemented except for the new name for Chapterbooks.