Currently the Target-Editor contains two sections "Content" and
"Environment" that roughly explain what these things can be used for if
one clicks on the corresponding tabs. In practice, these information is
barley usable for todays work an users uncertain would better consult
the Eclipse Help or read a tutorial on PDE. More worse, these clutter
the UI and steal valuable space not available for the actual content of
the location leading to scrollbars appearing.

This now removes the sections entirely ro reclaim the space for
something the user is actually interested in.