Changed the way the Clover report is generated.
Used the existing targets, instead of having to maintain two different sets
of targets to build with or without Clover.
Changed order of target dependencies for clover.tests so that instrumented
classes are built before the test classes.
Removed the separate target folder for instrumented classes. If a separate
target folder is used, separate classpaths are required when testing with
Clover than when not using Clover.
* project.properties:
Removed the target.clover.dir property definition.
Updated clover.dbdir to put the DB somewhere safe.
Set clover.excluded so as not instrument the test classes themselves.
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