Ideal staging branch v2.062-b1 for dmd

Current [dmd2beta.zip](http://ftp.digitalmars.com/dmd2beta.zip
) is based on b94129918bfb929db2c0e2a8728c8ccfcd1d6590.
But, current 'staging' branch does not reflect the fact.

This pull request imports all changes ("v2.061" tag to b94129918bfb929db2c0e2a8728c8ccfcd1d6590) into 'staging' branch.