incrementing manifests to 1.2.3

git-svn-id: http://dev.eclipse.org/svnroot/technology/org.eclipse.stem/trunk/data@2513 92a21009-5b66-0410-b83a-dc787c41c6e9
12 files changed
tree: a0c5fe68b80666941b1c9e503b46961356baf87f
  1. geography/
  2. org.eclipse.stem.internal.data/
  3. population/