Log message:
Convert qemu-0 and qemu options to an optional group.

No functional change intended; this merely uses
PKG_OPTIONS_OPTIONAL_GROUPS to choose qemu-0 vs qemu.
(Pointed out by wiz@.)

Log message:
Add options for qemu and xen, and disable all by default.

Before, anita depended on qemu0 or qemu.  Now, it has options for
qemu-0, qemu (currently 2) and xen (currently 4.1).  By default, all
are off because all of them are quite large and they need only be
present at run time.

Discussed with gson@, who did not object.

Log message:
Mark packages that are not ready for python-3.3 also not ready for 3.4,
until proven otherwise.

Log message:
Update misc/py-anita to 1.32.  Changes from 1.31:

Fix installation of source and debug sets, which had been broken since
the label displayed by sysinst was changed from "Source sets" to
"Source and debug sets".

Log message:
Mark packages as not ready for python-3.x where applicable;
either because they themselves are not ready or because a
dependency isn't. This is annotated by
PYTHON_VERSIONS_INCOMPATIBLE=  33 # not yet ported as of x.y.z
or
PYTHON_VERSIONS_INCOMPATIBLE=  33 # py-foo, py-bar
respectively, please use the same style for other packages,
and check during updates.

Use versioned_dependencies.mk where applicable.
Use REPLACE_PYTHON instead of handcoded alternatives, where applicable.
Reorder Makefile sections into standard order, where applicable.

Remove PYTHON_VERSIONS_INCLUDE_3X lines since that will be default
with the next commit.

Whitespace cleanups and other nits corrected, where necessary.

Log message:
Fix DEPENDS pattern.

Log message:
Ooops, copy & pasto: remove bogus lua dependency

Log message:
Make the dependency on qemu or qemu-0 selectable via an option (defaulting
to qemu-0)

Log message:
Update misc/py-anita to 1.31.  Changes from 1.30:

Fix a failure to consume a shell prompt which would cause it to remain
buffered and later be mistaken for one that had not yet issued.  For
added protection, add a unique serial number to each prompt.

Omit drive index from qemu command line for backwards compatibility
with scripts written for anita 1.29 or older.

Fix X11 set names.

Log message:
Add a note about qemu version, pointing to the man page.

This is a comment-only change.