pom.xml: configure to using groovy eclipse compiler.

@see http://groovy.codehaus.org/Groovy-Eclipse+compiler+plugin+for+Maven
CatalogUtilsTest: partially ported to Spock+Groovy
removed TODO
CatalogUtilsTest: renamed two test cases.

Found during porting unit tests to SpockFramework.

No functional changes.
ported more