Text charts: bars start on the axis line and end on tick lines

Text ticks, gridlines and the axis are lines through the middle of their
cells, but values were placed from the cells' edges: a bar started at
the top edge of the axis row, half a row above the axis line, and a
value on a tick ended half a row above its gridline. The same held
across, for horizontal bars and the value axis column. Spans are now
placed half a cell back (inCells), so columns, bars, stacks, areas and
negative values start in the middle of the axis row or column, with a
half block there, and line charts' braille dots follow the same
mapping. Golden charts, golden screens and the chart demos are
updated.

commit

60343c36f87c37a4792ea156d05f447b5d9d4281

parent

e893e7b620f74cb5bf975f87b7b37760ca5d1b3b

author

Dami <dami.etoile@gmail.com>