port uninstall should show versions and revisions in natural order

[ryandesign (Ryan Carsten Schmidt)]

Versions (#13031) and revisions (#17344) are shown in natural order in the output of port installed:

$ port installed foo
The following ports are currently installed:
  foo @1.9_2
  foo @1.10_2
  foo @1.10_10 (active)

but not in the output of port uninstall:

$ port uninstall foo
--->  The following versions of foo are currently installed:
--->  	foo @1.10_10 (active)
--->  	foo @1.10_2
--->  	foo @1.9_2
Error: port uninstall failed: Registry error: Please specify the full version as recorded in the port registry.

The desired output from port uninstall foo is:

$ port uninstall foo
--->  The following versions of foo are currently installed:
--->  	foo @1.9_2
--->  	foo @1.10_2
--->  	foo @1.10_10 (active)
Error: port uninstall failed: Registry error: Please specify the full version as recorded in the port registry.

[afb@…]

Fixed, r59770.