Log message:
Add a comment with installation instructions for next update.

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:
Convert to use versioned_dependencies.mk.

Log message:
Fix packaging with python-2.6.x.

Log message:
Import py27-CalendarServer-4.2 as wip/py-CalendarServer.

The open source Calendar and Contacts Server project is a
standards-compliant server implementing the CalDAV and CardDAV
protocols. It provides a shared location on the network allowing
multiple users to store and edit calendaring and contact information.

CalDAV is an Internet standard allowing a client to access scheduling
information on a remote server. It extends the WebDAV (an HTTP-based
protocol for data manipulation) specification and uses the iCalendar
format for the data. The protocol is defined by RFC 4791. It allows
multiple clients access to the same information thus allowing
cooperative planning and information sharing. Many server and client
applications support the protocol.

CardDAV is an address book client/server protocol designed to allow
users to access and share contact data on a server. The CardDAV
protocol is defined by RFC 6352.