Checks XS0107 (statically invalid @select) even if an option value is provided. (See #506)
Test ab-option-024.xml is expected to fail with error code err:XS0107.
<p:declare-step xmlns:err="http://www.w3.org/ns/xproc-error" xmlns:p="http://www.w3.org/ns/xproc" version="3.0">
   <p:output port="result">
   <p:option name="option" required="false" select="5+$undeclared">
   <p:identity>
      <p:with-input>
         <doc>{$option}</doc>
      </p:with-input>
   </p:identity>
</p:declare-step>
Changed @select expression, so it is statically invalid.
Changed error code from XS0071 to XS0107.
New tests and some previous texts adapted to recent development
added new tests