Client cleanup; lots of javadoc
Improved testing/javadoc/argument-checking for the ClientService
Improved ClientService javadoc
Minor checkstyle fixes in CLientServiceProxy
#3767 Unnecessary object instantiation removed.
Thanks to @cmuramoto for pointing this out!
ignored tests with missing features
end of life for ProblematicTest.class
Merge pull request #3790 from mesutcelik/problematicTestsAreGone

end of life for ProblematicTest.class
Merge pull request #3764 from pveentjer/cleanup/3.x/client-further-cleanup

Cleanup/3.x/client further cleanup
Merge pull request #3771 from jerrinot/papercuts/web-session-garbage-opto

Unnecessary object instantiation removed.
Authoring the Preface for Reference Manual