Further improve indentation of compilation results on the console

Further improve indentation of compilation results on the console

In CompilationResult.toString, no longer indent like this:

  [warning 1] warning at
              after() : execution(FooBar Blah.*()) {
                                  ^^^^^^
              xxx FooBar [Xlint:invalidAbsoluteTypeName]

Instead, always just indent by 2 spaces, saving screen real estate:

  [warning 1] warning at
    after() : execution(FooBar Blah.*()) {
                        ^^^^^^
    xxx FooBar [Xlint:invalidAbsoluteTypeName]

Also further streamline/simplify the code a bit.

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