Do not auto-detect Eclipse when calling the EclipseHelper as main class

There needs to be a way to force the EclipseHelper to index all it can.
The best idea is to make this automatic when calling EclipseHelper as a
main class because we *know* that the developer wants to index the
annotations in this case, even if Eclipse Indigo has passed the class path
elements in a semi-random order.

Wished-for by Christian Dietz.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>