merge_edges.py: write all edge information to an SQLite database file called edges.sqlite

When I saved a static html page for each edge (e.g., http://118.25.96.118/static/edges/AT1G20910_AT1G30100_0.html), it took
5GB disk space for saving 1 million html pages.  Not very disk space efficient.

An alternative is to save all edge information in a database table (i.e., edge), and query this database table for a
particular edge.

The database file edges.sqlite takes less than 200MB for 1 million edges, requiring 10 times smaller space than the static
approach.  The reason is that we do not have a lot of HTML tags in the database.  Quite happy about that, though it seems
that filling a database is a bit slower (2 hours??? for 1 million rows).

Also updated two files that were affected: update_network.py and update_network_by_force.py.  Now instead of copying 1 million
static html page to the Webapp, I just need to copy edges.sqlite to static/edges/.  Faster.

In the Webapp, I updated start_webapp.py and added a file templates/edge.html for handling dynamic page generation.

-Hui

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