Fixed some potential null dereferences.


git-svn-id: http://sbuild.tototec.de/svn/sbuild/trunk@403 024a02f7-42f7-40fc-9f58-65666d1f2450
Cache Scala compile instance when reading projects, to improve compilation speed for build files.
Show stack traces in error case. 


git-svn-id: http://sbuild.tototec.de/svn/sbuild/trunk@404 024a02f7-42f7-40fc-9f58-65666d1f2450
Updated changelog.


git-svn-id: http://sbuild.tototec.de/svn/sbuild/trunk@405 024a02f7-42f7-40fc-9f58-65666d1f2450
fixed typo.


git-svn-id: http://sbuild.tototec.de/svn/sbuild/trunk@406 024a02f7-42f7-40fc-9f58-65666d1f2450
Fixed a NPE in --just-clean-recursive.


git-svn-id: http://sbuild.tototec.de/svn/sbuild/trunk@407 024a02f7-42f7-40fc-9f58-65666d1f2450