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Optimization to avoid solr query for editions with work.edition_count == 1

The solr query is made to find the default cover of the work. When
there is only one edition, the cover will either be work.cover or
edition.cover.
Allow specifying None as cover_url.

Using False as the default_value for cover_url so that cover_url can be
set to None when there is no cover url.
Merge branch 'master' of github.com:internetarchive/openlibrary
fix
Added --nocommit option to update_work.py
Added ebook_count_i and last_modified_i fields to works solr.
Added --monkeypatch option to replace query_iter and withKey functions with new ones that talk to database directly.
updates to library register page
validation
more validation
validation
validation
validate
validate IP ranges
show IP range errors
only show error if IP ranges are invalid
Don't crash if BSS server is down.
[readlinks]: Take solr host name from config.

Hardcoding hostnames in code is very bad.