Revert "Adopted Eclipse project settings. Make use of maven/m2e plugin."

This reverts commit 7213578d971a36c7ca366655733899c7494beaff.
Revert "Major change in build: switching from maven/tycho to maven-bundle-plugin."

This reverts commit 635f82bdfb31fb48f036dd3c3dba3c65d81e9215.
Revert "Moving tests to extra package again."

This reverts commit 851b1c05f3c15957b0a0e8a064faa45dc85a1dab.