WP 34S and 31S bugs and fixes

[Bit]

The Qt 82240B emulator only printed a single pixel of spacing between characters instead of two as the real device. That's how 24 characters, each 5 pixel wide, use up the entire horizontal resolution: 24*5 + 23*2 = 166.

The following is perfectly aligned when printed by the real printer but not in the emulator:
XXX
XΔX

I've committed a fix to SVN.