PHP tests to check the DOM_NOT_FOUND error message is properly raised by the DOMNode::insertBefore method
Fix the path of the book.xml file
Using absolute path to get the file note.xml
Fixs the name of the variable in the assertion
Includes 5 new phpTests to check that the error message DOM_NOT_FOUND is properly raised by the method DOMNode::insertBefore(newNode, [refNode]).

Each file covers a different test case

    DOMNode_insertBefore_error2.phpt: refNode is a sibling of the node where newNode wanted to be inserted.
    DOMNode_insertBefore_error3.phpt: refNode is the parent of the node where newNode wanted to be inserted.
    DOMNode_insertBefore_error4.phpt: refNode is a brand new node.
    DOMNode_insertBefore_error5.phpt: refNode is a descendant (not child) of the node where newNode wanted to be inserted.
    DOMNode_insertBefore_error6.phpt: refNode is the node where newNode wanted to be inserted.
Merge branch 'master' of https://github.com/dejalatele/php-src
Merge branch 'master' of https://github.com/dejalatele/php-src