* quick-fix for extraneous empty line(s) in manifest editor

Extraneous lines are errneous to the manifest compiler,
but it does not recommend / provide a resolution.
Add a quick fix to remove extraneous line.
Fixes: https://github.com/eclipse-pde/eclipse.pde/issues/563

* fixup: fix the copyright header

* fixup: address review comments
1. code formatting
2. updating the copyright header