#622 Prepare Git repo for v1.0 development

• I just followed our standard instructions, with separate commits per step.
• Two things of note:
  • Updating the import feature version is no longer needed. It is now automatic. I adapted the instructions for this.
  • The import feature version no longer have the .qualifier part. Instead they now get a match=compatible. Tycho changed this automatically for me. I think that is fine, and this way we get the change only once and not again on future updates.

Closes #622 (closed)