Create 1.5 branch.

Create 1.4 branch.

branches/1.3: Bump version number to 1.3.0 and update year to 2006.

branches/1.2: Bump version number to 1.2.1.

branches/1.2: Backport r422 from trunk.

Create 1.1 branch.

Create 1.0 branch.

Make Windows version check failure non-fatal.