Clean up violations of the 120 column width recommendation

[jbphet]

Our coding-conventions.md document says, "Generally, lines should not exceed 120 columns. Break up long statements, expressions...". I'm running into a lot of violations of this recommendation, and it makes it tricky for people like me with older eyes who have to use larger fonts. I'd recommend making a pass through the code and cleaning this up a bit. Some violations are reasonable, but I've seen quite a few already in the handful of files that I've looked at.

Here is an example:

[zepumph]

@Luisav1 can you please take the lead on this?

[Luisav1]

Thanks @jbphet! This was all fixed in the commits above. Closing.