Changed the Maven package from net.jonp to net.jonp.sorm.

Since net.jonp is the superpackage for everything I write, it makes more sense
to use sub-packages of that to distinguish each individual project.
Updated the README with additional getting-started instructions.
Updated the manual to include documentation of newer features, and format fixes.

New features included:
 * Grouped fields
 * Pre/Post ID generators
 * Multiple SQL statements in a block

Formatting fixes are for egregiously overful hboxes, which were jarringly ugly
in the rendered output. They will probably need to be fixed any time the manual
is updated. Perhaps there is a way to tell Latex to do it automatically...