annotate docs/spec/fv4.tikz @ 569:327fd3aa17e6

Shifted the query type condition into setquerytype, so it's no longer
stored as a string. Also did some rejigging to get the tabs consistent,
and added some comments for a few less obvious areas of code.

\foreach \y/\col in {0/4,0.2/89,0.4/96,0.6/58,0.8/25} {
  \fill[black!\col!white] ($(-0.1,0)+(0,\y)$) rectangle ($(0.1,0.2)+(0,\y)$);
}