[MERGE] Change the `bzr init-repo` default to --trees (#53483)

[Aaron Bentley]

Aaron Bentley has voted -0.
Status is now: Approved
Comment:
My preference would be to focus on making the right way easy, rather 
than making the easy way the default, but I realize we're never going to 
agree on this.

For details, see: 
http://bundlebuggy.aaronbentley.com/request/%3C20070202170420.GC6165%40larstiq.dyndns.org%3E