add bold files

[agoujot]

@samwilson
Bold letters currently have two problems:

• They aren't actually bold
• They aren't the same width as non-bold letters. (about 2.6% larger)
  I have commited bold files I made using fontforge, that are visibly bold and are all the same width as non-bold letters.

I have tested, and just putting the bold files next to the non-bold files works.

[agoujot]

Oh, and also, in case you're wondering why the code ends up in bold, it's for the syntax highlighters.

(The reason I discovered the 2.6% issue is that I'm using a syntax highlighter that relies on overlaying stuff, and the overlay was slightly shifted from the code.)