.
Fixed absolute path in SVG graph
add a column member to all Definitions

only the line is currently tracked, but report
a precise location, track also the column.
make the scanners fill in the column information

Only C scanner reports a correct column, while for
the other languages, a default value 1 is used.
marshall column info
xmlgen: add attribute 'column' for 'location' tag
add column to Definition call sites
track location for references and referencedby
xmlgen: add attributes atline,atcol,infile for 'references' tag
add sqlite3gen support