Chapters 1,2,3 and some latex template modifications.

* I have updated Chapters 1, 2 and 3 with my marked previously sent to Stephane for review.  

* One my suggestions was to have an action-icon and poking around in common.tex I found an existing definition of  \dothis which I was able to use as raw latex.  Something probably needs to be defined for the other output formats.   I copied  icon-lighthouse-128x128.png from http://files.pharo.org/media/logo/ and renamed it pharo.png.  I thought I needed to update common.tex to that name, but I since discover I didn't need to, but I'm not sure the best way to revert common.tex.

* I have a strong preference for figures appearing after their first reference.  A bit presumptive, but I added \usepackage{flatter} to chapter.latex.template to help with that.  Maybe this should have been done in common.tex.