PostgreSQL the right choice?

I have been looking for a RDBMS to deploy with our solar energy
simulation.

MySQL looks like it's free until you want to bundle it with a commercial
application, at which time license fees are required. What is the
situation with PostgreSQL?

Given that we have a Java application and don't have the manpower to
port a DBMS, what are the platforms on which PostgreSQL is currently
stable?

Is it possible to deploy PostgreSQL via an installer program, then
automatically run a script to generate the tables and populate them with
data from flat files?

Thanks for any comments.
--
Richard Chrenko, Informatik
Institut für Solartechnik SPF
Hochschule für Technik Rapperswil, Oberseestr.10, CH-8640 Rapperswil
Tel +41 55 222 48 33, Fax +41 55 222 48 44, http://www.solarenergy.ch