And some other minor refinements

 - cover page:
    * remove explicit copyright notice
    * add same acknowledgment as in papers
 - use a single main makefile
 - move together common images
 - set image search path to common_tex/img
 - include a unified tex header file

 - add detailed installation instructions
 - refine appendix
 - various smaller refinements and style changes

 - add captions and change references
 - refine formatting

Addresses issue #33.