VSIPLXX13 — No Highlight's for implementation values

I VSIPL before OMG (VSIPL 1.3) some items were highlighted with yellow in the document to indicate implementation dependent values. For instance the vector index (_vi) must be unsigned but need not be long int. Also names used for structures used in incomplete typedefs need not be as shown in the manual although the VSIPL type name is required. The highlight is not in the new manual but the paragraph at the head of the section indicates it. Need to clarify this for the new specification

Substituted highlighted text with "implementation-dependent" (throughout section 2.1 and 2.2)