Add warning, as suggested on dev@; rinse and repeat for Announcement

  APACHE INSTALLATION OVERVIEW

  CAUTION

  -------

  This package represents a legacy version of the Apache HTTP Server software

  and is not current.

  Please note that Apache Web Server Project will only provide maintenance

  releases of the 2.2.x flavor through June of 2017, and will provide some

  security patches beyond this date through at least December of 2017.

  Minimal maintenance patches of 2.2.x are expected throughout this period,

  and users are strongly discouraged from deploying this legacy release.

  Also note, this package includes very stale and known-vulnerable versions

  of the Expat [http://expat.sourceforge.net/] and PCRE [http://www.pcre.org/]

  packages. Users are strongly encouraged to first install the most recent

  versions of these components.

  Quick Start - Unix

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