Resolving VUFIND-802 (HorizonXMLAPI bug fixes).
Thanks to Jay Roos.
Resolving VUFIND-803 (AlphaBrowse links not using phrase search).
Moved tag parsing out of record drivers; centralized trimming.
Improved proximity cleanup.
Tag parsing is now a pluggable service; also added deduping.
Added truncation in tag parser to avoid illegal lengths.
Resolving VUFIND-804 (more efficient Horizon getStatuses).
Thanks to Jay Roos.
Added missing comments.
Tag deduplication functionality (see VUFIND-805).
Upgrade to SolrMarc 2.5.2.
Maximum tag length is now configurable (resolves VUFIND-805).
Merge remote-tracking branch 'vufind/master' into development