Minor changes to the svd lab. Added a problem, made the other problem a
bit more specific. Added solutions to the solution file.
Various minor edits, mainly typos.
Merge pull request #380 from abefrandsen/svd

Minor changes to the svd lab.
Merge pull request #381 from abefrandsen/student_edits

Various minor edits, mainly typos.
add more whitespace between paragraphs

Also pad the problem boxes so they look less crowded.

We add extra space between paragraphs to give a less dense feel of the
text material.  The space is minimal so it doesn't inflate the total
page count by too much.  It helps the labs read easier.
Merge pull request #383 from ayr0/para_spacing

add more whitespace between paragraphs
Merge pull request #382 from abefrandsen/cepstrum

Added FourierExtensions lab.
Could use another look-over. The Cepstrum section can be improved, and the 2D FFT can be expanded.
Fixed a couple of errors in the solutions file to Fourier Extensions.