Generate and install .conf files

  (with heavy lifting from tdonovan!).

Install sample docroot (if the top directory doesn't exist).

Change installation of error and icons directories to match
Unix -- only if the top directory doesn't exist.

Provide a simple Perl script to help with non-standard copy
semantics used by the install.

THIS ADDS PERL AS A BUILD PREREQ.  (The VisualStudio-specific
Windows build system required it too.)



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1518376 13f79535-47bb-0310-9956-ffa450edef68