Extract Legacy Installer

* Legacy installers are now in their own files, simplifiying the
start scripts (which reflect a different concern).
* Installation documentation has been enhanced.
* Batch files have been refactored to be a little more readable.
Ensure that the launchd dir exists on OSX

This stops the install failing on a clean OSX install
Better error messages when upgrading unclean store

Now produces more helpful error messages when people attempt to upgrade store files
that have not been shut down cleanly. We don't tell people that we cannot upgrade
from some weird binary string of a version number, but instead correctly tell them
that the store file has not been shut down properly. When this happens, they should
open the store again in the old version, shut it down properly, and then try
upgrading it again. That should do the trick.
use neo4j-server.properties in gui, allowing user to edit it
Fixed #1471 - SETting a relationship to a map value fails
Merge pull request #1483 from chrisvest/better-upgrade-error-messages

Better error messages when upgrading unclean store
Merge pull request #1485 from systay/1471

Fixed #1471 - SETting a relationship to a map value fails
Consistency checker: check that nodes are indexed.

o Directly use PropertyStore instead of the RecordAccess API
  to reduce code duplication at the expense of deferred check mechanism.
  This could prove to be an expensive check because of the need to read
  whole property chain for each node.
o Add parameters for turning off label scan store and index checks.
o Check uniqueness of unique indexes.
o Keep index accessors open for duration of entire consistency check.
o Extract tasks into their own class.
Consistency checker: use last committed transaction id as baseline for injected transactions.
Consistency checker: unwind nested test setup.
Test and fix for failing to start transaction in MasterImpl.
Merge pull request #1484 from akollegger/desktop-server-config

neo4j-desktop use of server properties
Merge pull request #1456 from apcj/2.0-ccheck-node-to-indexes

Consistency checker: check that nodes are indexed.
Improve thread safety of EphemeralFileSystem.

The file system needs to be synchronized around the buffer that holds
the actual data. Also, the "scratch pad" buffers for reading chunks from
those data buffers may not be shared between threads.
Merge pull request #1482 from benbc/2.0-legacy-installer

2.0 legacy installer
Consistency checker: close index accessors.
Updated instructions for cloud.
subtree merged neo4j-browser project into community/browser, then integrated into maven build
moved browser module to part of neo-full-build profile because of extra toolchain requirements
Wire browser into Maven project dependencies.