renamed condition variable example

removed executable

added condition variable example

added pthread example

updated signal examples

updated sbrktest

added exectest

added sbrktest

fixed line length

updated queuetest

adding xv6 tips

added fork/dup example

non-option permutation

Added some examples about getopt and reading files from discussion section today

up to date

Adding signal handling stuff

simplified tsearch result handling

Updated comment about tsearch interface

added examples for multiple modules

updated tsearch