Readme updated, SLQ seed files renamed

Readme updated to say:
What PhenoFront is
How to install it (incl development system)
Future work
Ignoring conf files
Pre-install tests, took out garbage

Added two test classes to verify that the databases we're accessing have
the necessary structure
Removed unused files
Added dialog to the preview query button to warn users of slow loading
large previews
Download manager, metadata tagging

Added download manager java applet, still having trouble with signing
and permissions so it doesn't work in websites yet
Added metadata tagging and search functionality, allowing users to
tag/untag queries with metadata and search by it according to various
criteria
Added snapshot specific download URI similar to /massdownload but keys
off a CSV of snapshot IDs, the experiment name, and a download key
(meant to be used by the download manager applet)
Refactored SnapshotDao and SnapshotDaoImpl, simplifying and collapsing
much of the behavior with a settings class
Once and for all fixed "ID" variable naming. All IDs are now camel case
Refactored database tests and added tests for the metadata tagging
Changes to snapshots download