[imp] mailbox listing speed-up

[Colin Guthrie]

Ziba Scott wrote:
> No problem.  Here it is.  Again, the bulk of the diff is because of the
> indentations I added to the blocks which I put inside a new if
> statement.  I'm also attaching the whole Tree.php file in case that's
> more convenient.

diff -ub or svn diff --diff-cmd diff -x -ub wrok well here for visual 
reading - they ignore whitespace changes :)

Col