Enhance Ant tasks by adding new sub-types and attributes:
- fixed - default value as now, fixed-size coverage recorder requiring presence of clover.db to read the size
- growable - like for Android, no need to have clover.db
- shared - for Grails app, not only with dynamic size, but also reusing the same instance of recorder if initstring is the same
Parse it on Ant level, pass it to InstrumentationConfig and Instrumenter.