gEDA-user: [pcb] lesstif board flip

[DJ Delorie <dj@xxxxxxxxxxx>]

Finally got around to adding board flipping to the lesstif hid.

      Tab = up/down flip (same key/action as Xaw pcb)
Shift-Tab = left/right flip
 Ctrl-Tab = spin 180 degrees (by doing both flips)

This is tied in with the SwapSides setting (so you always see the
"right" silk) and the smart layer controls (i.e. if you're viewing
component side, component layer is active, and solder layer is not
shown, flipping toggles all three - view solder, solder active,
component hidden).