Initial Zotero 1.5 Megacommit

Apologies for the massive (and, due to data_access.js splitting, difficult-to-follow) commit. Please note that external code that accesses the data layer may need to be tweaked for compatibility. Here's a comprehensive-as-possible changelog:

- Added server sync functionality (incomplete)
- Overhaul of data layer
  - Split data_access.js into separate files (item.js, items.js, creator.js, etc.)
  - Made creators and collections first-class objects, similar to items
  - Constructors now take id as first parameter, e.g. new Zotero.Item(1234, 'book'), to allow explicit id setting and id changing
  - Made various data layer operations (including attachment fields) require a save() rather than making direct DB changes
  - Better handling of unsaved objects
    - Item.setCreator() now takes creator objects instead of creator ids, and Item.save() will auto-save unsaved creators
    - clone() now works on unsaved objects
  - Newly created object instances are now disabled after save() to force refetch of globally accessible instance using Zotero.(Items|Creators|etc.).get()
  - Added secondary lookup key to data objects
  - Deprecated getID() and getItemType() methods in favor of .id and .itemTypeID properties
  - toArray() deprecated in favor of serialize(), which has a somewhat modified format
  - Added support for multiple creators with identical data -- currently unimplemented in interface and most of data layer
  - Added Item.diff() for comparing item metadata
- Database changes
  - Added SQLite triggers to enforce foreign key constraints
  - Added Zotero.DB.transactionVacuum flag to run a VACUUM after a transaction
  - Added Zotero.DB.transactionDate, .transactionDateTime, and transactionTimestamp to retrieve consistent timestamps for entire transaction
  - Properly store 64-bit integers
  - Set PRAGMA locking_mode=EXCLUSIVE on database
  - Set SQLite page size to 4096 on new databases
  - Set SQLite page cache to 8MB
  - Do some database cleanup and integrity checking on migration from 1.0 branch
  - Removed IF NOT EXISTS from userdata.sql CREATE statements -- userdata.sql is now processed only on DB initialization
  - Removed itemNoteTitles table and moved titles into itemNotes
- Abstracted metadata edit box and note box into flexible XBL bindings with various modes, including read-only states
- Massive speed-up of item tree view
- Several fixes from 1.0 branch for Fx3 compatibility
- Added Notifier observer to log delete events for syncing
- Zotero.Utilities changes
  - New methods getSQLDataType() and md5()
  - Removed onError from Zotero.Utilities.HTTP.doGet()
  - Don't display more than 1024 characters in doPost() debug output
  - Don't display passwords in doPost() debug output
- Added Zotero.Notifier.untrigger() -- currently unused
- Added Zotero.reloadDataObjects() to reset all in-memory objects
- Added |chars| parameter to Zotero.randomString(len, chars)
- Added Zotero.Date.getUnixTimestamp() and Date.toUnixTimestamp(JSDate)
- Adjusted zotero-service.js to simplify file inclusion

Various things (such as tags) are temporarily broken.

system.sql

@@ -1,4 +1,4 @@
--- 20
+-- 21
 
 -- This file creates system tables that can be safely wiped and reinitialized
 -- at any time, as long as existing ids are preserved.
@@ -101,6 +101,13 @@ CREATE TABLE itemTypeCreatorTypes (
     FOREIGN KEY (creatorTypeID) REFERENCES creatorTypes(creatorTypeID)
 );
     
+DROP TABLE IF EXISTS syncObjectTypes;
+CREATE TABLE syncObjectTypes (
+    syncObjectTypeID INTEGER PRIMARY KEY,
+    name TEXT
+);
+CREATE INDEX syncObjectTypes_name ON syncObjectTypes(name);
+
 DROP TABLE IF EXISTS transactionSets;
 CREATE TABLE transactionSets (
     transactionSetID INTEGER PRIMARY KEY,
@@ -1237,3 +1244,8 @@ INSERT INTO "charsets" VALUES(165, 'x-unicode-2-0-utf-7');
 INSERT INTO "charsets" VALUES(166, 'x-x-big5');
 INSERT INTO "charsets" VALUES(167, 'x0201');
 INSERT INTO "charsets" VALUES(168, 'x0212');
+
+INSERT INTO "syncObjectTypes" VALUES(1, 'collection');
+INSERT INTO "syncObjectTypes" VALUES(2, 'creator');
+INSERT INTO "syncObjectTypes" VALUES(3, 'item');
+INSERT INTO "syncObjectTypes" VALUES(4, 'savedSearch');