#1 Will not install on PHP 4.1.2

[Tom de Grunt]

Sourceforge uses PHP 4.1.2 and atomic CMS will not
install on this.

Problems:
1) PEAR version not up to date

2) Function "is_a" not defined upon working with an
updated PEAR version (installed locally)

3) It's not possible to set the include path yourself.

Notes made during getting the cms to work on sourceforge:

Web absolute path:
/home/groups/a/at/atomiccms/

Pear can be found in subdirectory:
pear/share/pear

New function to be added to atomiccms.php:
if (!function_exists('is_a')) {
function is_a( $object, $className ) {
return ((strtolower($className) == get_class($object))
or (is_subclass_of($object, $className)));
}
}

(used in DB.php of PEAR).