In sqFileOpen() ensure that Mac file characteristics are set only when a new file is created


git-svn-id: http://squeakvm.org/svn/squeak/trunk/platforms/Cross/plugins@2953 fa1542d4-bde8-0310-ad64-8ed1123d492a
Update the checkin date for the plugins.


git-svn-id: http://squeakvm.org/svn/squeak/trunk/platforms/Cross/plugins@2954 fa1542d4-bde8-0310-ad64-8ed1123d492a