Split/rearrange labs

Split CorrCovariance and LeastSquares labs into separate folders with
their datasets.

Updates to Vol1.tex and Vol2.tex
updates to volume structure
missing files for english vowels lab
update vol3 tex

Update Volume 3 to include some missing labs
missing /
remove the need of unicode for a single letter

Make a troublsome unicode letter an image instead that can be included.
  Some platforms are difficult to use latex with unicode.
update Vol1

Remove some old orphaned labs and left over crud.
remove ,
Merge pull request #197 from ayr0/vols

Updates to volume tex files