Replace C3P0 by Tomcat JDBC Pool in case C3P0 license issues are not resolved

In case the license issues with C3P0 (currently LGPL) are not resolved, we should switch to the Apache Tomcat JDBC connection pool instead. It is documented at:

http://tomcat.apache.org/tomcat-7.0-doc/jdbc-pool.html

The Maven Artifact for the connection pool is:

<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>tomcat-jdbc</artifactId>
<version>7.0.25</version>
</dependency>