Revert "Switch to plain Scala OSGi bundles."

Partial revert, kept the Java 1.6 dependency definition.

This reverts commit ba7b8901cd130700ed19471751038fa256f172b7.
Revert "Bump to the new plugin-profiles version."

This reverts commit b2a75a3f4fb002cf6057a73e6daa9f100f39e768.
Revert "Fixed source compatibility with Scala IDE master"

This reverts commit 8e3c135a021935cd01fde42f5daea89136fb1a4d.
Revert "Puts the Java method search outside the askOption"

Partial revert. Only the part with the new API of the presentation
compiler.

This reverts commit 131c55902e064b4a3692b3e232d2c61246d6e716.