[maven-release-plugin] prepare release fiji-lib-2.1.3

[maven-release-plugin] copy for tag fiji-lib-2.1.2

[maven-release-plugin] copy for tag fiji-lib-2.1.1

[maven-release-plugin] copy for tag fiji-lib-2.1.0

First release based on a pom-fiji release version

Bump to first release version, ever!

The fiji-lib component is really very solid for years already. It was
just sloppy development style (convenient for the developer, horrible
for everybody else...).

Let's raise the standard.

Signed-off-by: Johannes Schindelin <[email protected]>