Maybe, the XML files and Maven wrapper files will follow. First, let us
find out if this breaks the build, maybe some tests are asserting on
"http:". But there, the replacement would also have taken place, so
probably it just works.

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>

Headlines per ADOC file should start at level 1, not 2. Adjusting the
level offset for books helps to avoid warnings when including book
chapters, but still allows to also use the chapters as stand-alone
documents.

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>

Follow-up on previous rename-only commit. This time, the binaries are
real PNGs. The asciidoc and other references to them have also been
replaced. File figures_classes.png in the teaching materials also was
rotated by 90° to display it correctly.

Background: The Asciidoctor PDF back-end cannot handle GIFs directly
without an additional Ruby Gem. It is easier to only use PNGs and JPEGs.

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>

The files are still GIFs for now. In the next steps after the rename,
they will be replaced by real PNGs.

Background: The Asciidoctor PDF back-end cannot handle GIFs directly
without an additional Ruby Gem. It is easier to only use PNGs and JPEGs.

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>

Some originals have been deleted already. Others, especially the user
guides, still exist in both formats because they have not been
proof-read and probably lots of links do not function as expected. But I
want to see what the files look like directly on GitHun.

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>

This was required by the Eclipse team as one precondition for the next
release.

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>

  renaming support.Log.log to support.Log.write
  renaming test.Test to test.CoreTest
  (r)ing aspectj
  clearing up a few random things

looks much nicer and is a bit more streamlined.

  minor cleanups/formatting for OOPSLA
  added around/proceed caching example

starting page for additional work

updated section 3 tests