views_php_handler_field->render() adds space to both sides of output

views_php_handler_field->render() adds space to both sides of output.

i.e. Setting the "Output code" field to:

<?php
  echo 'Hello';
?>

Will produce:

 Hello 

Note the space before and after the Hello.

This can potentially cause problems; for example, when using a php field as a token for the link path for another field.

See patch in Comment #1 for a fix.