see #8902 - Small performance enhancements / coding style (patch by shinigami):
- effective double comparison
- new Date().getTime() => System.currentTimeMillis()

git-svn-id: http://josm.openstreetmap.de/svn/trunk@6102 0c6e7542-c601-0410-84e7-c038aed88b3b
Merge branch 'master' into mirror