Edits To DevGuide


I just re-read the entire DevGuide with my editor hat on and made a bunch of small edits.  Here are the highlights:

* Removed a couple paragraphs from the block chain section which were outdated. One paragraph described things that have been moved elsewhere; the other paragraph described transaction fee details that are now better described in the Transactions section.

* The micropayment channel contract has been updated to use the terms "bond transaction" and "refund transaction" instead of the much less useful "first transaction" and "second transaction". The micropay image was updated similarly (also using fontname=Sans and optipng).

* I removed some unnecessary instances of millibits. I think the only millibits left correspond to images that use millibits.

* I deleted some old and now-unnecessary comments

* A bunch of minor grammar errors fixed, plus a bunch of small one-word or a-few-words changes that I think improve readability.