bbgen 0.2.0

• The board is drawn the way breadboards are made. With column 1 at the left, row j is now at the top and
  row a at the bottom, and each pair of rails has its - rail above its + rail, as on BusBoard's BB830, the
  MB-102 boards and Adafruit's. The drawing used to be the mirror image of a real board: its hole names didn't
  match the ones printed on yours, and a chip placed by its pin 1 (at:) could only go in upside down. A hole's
  name now means the hole with that name on your board. A file that places parts by hand keeps its drawing if
  its rows are swapped a↔j, b↔i, c↔h, d↔g, e↔f; the rails now default to -+ (top to
  bottom) on both sides.
• Placement keeps a part's body off every hole of its own pins' strips, leaving each pin a hole for its wire: a
  module whose body hangs over its pins' strips (an OLED) could be placed with no way to wire it.
• Placement no longer puts a chip's pin in a strip where the file has put a leg or a wire end of another net, or
  a pin or the chip's body on a hole the file takes: it used to short into LEDs placed by hand. When there's no
  other place for a chip, bbgen says so and names what's in the way, and it never returns a layout with a short
  of its own making.
• Placement draws chips toward what the file places: a leg placed by hand counts as a fixed pin of its net, and
  a chain of resistors or diodes bbgen places pulls the chip at its far end toward it. Place the LEDs, and the
  chip driving them through resistors lands beside them.
• A flat wire no longer crosses another flat wire: it moves to other holes in the same strips, or becomes a
  flexible jumper where none clear it. A signal wired along the board's outer row used to block the supply wires
  laid after it.
• A wire running under a resistor or other two-lead part says so in the checklist, naming the part to put in
  after it, as one under a raised module does.
• A closed pipe (bbgen check FILE --json | head) ends bbgen quietly instead of panicking.
• Parts that repeat around parts the file places are placed alike: each LED's resistor the same way round its
  LED, where the board leaves room. Chips keep off the strip across the trench from a hand-placed leg, where
  those parts go.