WVUThorns_Diagnostics defines new macro outside of the "% START CACTUS THORNGUIDE" block

[Roland Haas]

This breaks that <config>-ThornGuide target with

! Undefined control sequence.
l.42427 {\bf Title:} & \thornname
                                  \\
? 
! Emergency stop.
l.42427 

new macros must be defined inside of the magic comments ideally just below the comment % Add all definitions used in this documentation here which the documentation template contains.