Add hw32 files to repo

Improve comments

Hopefully get images to display in github

Finish chapter 30 homework

Remove executable files from repo

Start homework 30

Roll our own semaphore, as per chapter 31

Make a common main file for rw_lock to make creating a fairer version simple

Implement a reader-writer lock, as discussed in chapter 31. Output aims to show writer starvation.

Chapter 30 example code: increase the size of the buffer

Chapter 30 example code, up to "Two CVs And While", figure 30.10

Chapter 30 example code, up to "Single CV And While", figure 30.8

Add some comments to llist implementation

Fix segmentation fault for long lists (caused by too much recursion)

Build first iteration of hand-over-hand locked linked list