Fixes some more issues of 1.8 as reported by users.
No breaking changes in terms of configuration or classes for custom tasks, publishers, ....
These fixes did not make it for the 1.8.2 release.Highlights :
- Several Parallel Task fixes
- the syntax highlighter disables itself it logs are to big
default <buildLogBuildPlugin disableHighlightingWhenLogExceedsKB="50"/>
- Several preprocessor fixes