build - avoid using all CPU resources on multiprocessor box

It was slowing down my machine too much, so rather than maximum we use
max(maximum - 2, 1).
flip2mono - intial commit of data
flipflop - initial commit of data and styling of <pre>
guessnum - inital commit of data
hex - initial commit of data
style - make <code> tags similar to <pre> tags background and colour

Rather than grey background with red text make it dark green
background with white text.
liteit - initial commit of data
makebridge - initial commit of data
issues - add note that liteit is a favourite of mine