The version handling in LangUtil has been overhauled
to cope better with post 1.8 releases (JDK9 and JDK10 or 18.3
or whatever they call it). As part of this moved
to treating JDK9 as '9' rather than '1.9'. Also removed
duplicate version processing logic and had that defer to
the one place in LangUtil where we now deal with it.

Includes some generics tidyup in ajdoc. More ajdoc work
is necessary for Java10 because it removes the standard doclet
(old style). However trying to invoke the internal Javadoc
handler in Java10 is failing due to module visibility rules.

Signed-off-by: hsestupin <stupin.sergey@gmail.com>

Also fixed ajdoc tests to run correctly when executed via RunTheseBeforeYouCommit tests (previously they were not being run and silently failing).

- AJDT integration works
- generates documentation for all the AspectJ modules
- works on 1.3 and 1.4
- comments and Javadoc tags are properly preserved and resolved
 
Note that the hope is still for "declare" documentation to come in the form of a contribution.  

Getting it to work for our tree involved a bunch of bug fixes to deal with things like anonymous types.  To run from our tree in bootstrap mode use something like the attached batch script.  

I had to roll back some of Andy's fix to broken links: getRelativeComponent didn't work properly for internal anchor links (..html#<mumble>).  Andy, could you check this against the current thing against whatever was breaking for you, and ideally add that code patter to CoverageTestCase?

I added -XjavadocsInModel to make the addition of Javadoc strings to the ASM only happen when request it (prevent bloat of the model with strings.  The running time of ajdoc is now dominated by the compilation time.

for generating spacewar documentation.