Skeleton change: read from stdin as per lab doc.

NB POSSIBLE AUTOGRADER BREAK

Lab doc told students to use
    ./a.out < testfile.txt
to run their code; however the program actually took in a filename on
stdin.

Modified the code to read its input from stdin. Other option was to
update the lab document, but this is easier & more amenable to
autograding- that said, the autograder is probably not yet set up to use
this input format.
Formatting of lab05 doc
Revert "Skeleton change: read from stdin as per lab doc."

This reverts commit 5f3fc716d873b0d98ee659b7bb90f904b1c4478b.
Merge branch 'master' of https://github.com/aaronbloomfield/pdr
Merge branch 'master' of https://github.com/aaronbloomfield/pdr
Removed unused variables from timer.cpp

Have, for several years, caused unnecessary warnings with -Wall.
Revert "Skeleton change: read from stdin as per lab doc."

This reverts commit 5f3fc716d873b0d98ee659b7bb90f904b1c4478b.

Change disapproved by Prof. B.
Merge pull request #20 from wbthomason/master

Slight change to Lab 6 language
Merge pull request #19 from cceckman/master

Formatting and unused variables
Updated the .html files from the .md files after the two pull requests (#19 and #20)
Updated 08-ibcm.html; it's now ready to go
Updated daily announcements for tomorrow
Updates from Wednesday's lecture
Updates from the recording in lieu of today's lecture
Moved the text over to 09-x86, but no formatting yet
Formatted the first 2 (of 7) sections of the x86 lecture set
Worked a bit on the x86 book chapter (which required changes to the x86 slides); the x86 examples in the book now compile properly
Finished the first run of the 09-x86 slides (and added all the source code), but it still needs a lot of work
Explanation fix to lab 5's in-lab input format
Updated 09-x86, but these changes are from yesterday, as I forgot to include this file in the commit