added z to steps in algorithm
Merge https://github.com/kousu/stat440
Merge https://github.com/kousu/stat440
minor fix to the R file (needed source) and minor change to report
Merge https://github.com/kousu/stat440
Merge branch 'master' of https://github.com/Daniel306/stat440
[citation needed]
Improve typedefs, in prep for code cleanup.

 We didn't make much use of this formalism in cranking out this code, but now we have the time to do it right.