Build instructions update

Updated build instructions (about all I could handle today). A few new versions – tiff, gdal, php, grass. Changed everything to bash shell.

Sore throat moved up to my head and I’ve had a cold all week. And I’ve been working on how to enable php-apache/php-cgi switching without having users muck about in the Terminal. So PHP-CGI stuff still delayed. Installers are otherwise ready.