Changes

http://www.jogamp.org/bugzilla/show_bug.cgi?id=390

Adding 'plain' junit tests.
Plain stands for the simple processing of:
    ant.junit.compile: gluegen -> java/c files, javac/cc, jar
    ant.junit.run:     junit batch run

Avoiding 'black magic', ie kicking off gluegen and ant-compilation
from within the junit tests.

Same methodology as the JOGL junit tests,
junit test sources are under 'src/junit'

This way, the migration to other platform tests might be easier,
as well as the we don't need to pass through ant properties (ant - junit - ant),
see 3a32650d4229f9b4ad1f527d9e30c24ddb69bb3f.

start with gluegen.root ..