review: shorter time before axis break
write file date creation to meta header (key 3)
define file datefmt, add time_t to dogfile
open_dogfile read in, parse date
display date in reviewer meta line
reviewer helper function to find row centerline
retire row-timecode until accurate
review: bottom() and scale() helpers
review file zoom out
helper fn to make clean 1px lines
turn max_rows into a constant
rvw: convert from pixel-tracked y to row-idx