Lots of book formatting changes.

Changed default sizes of plots, changed the book template for
pdf creation, and lots of minor edits, most changing bold to
italic, and removing italic for emphasis.

pdf/book.tplx

@@ -1,10 +1,12 @@
 % Inherit from report
-((* extends 'report.tplx' *))
+%((* extends 'report.tplx' *))
  
+((* set cell_style = 'style_ipython.tplx' *))
  
 ((* block docclass *))
 \documentclass{book}
 \setcounter{chapter}{0}
+\raggedbottom
 ((* endblock docclass *))
  
 ((* block preamble *))
@@ -14,7 +16,9 @@
 \title{Kalman and Bayesian Filters in Python}
 \author{Roger R Labbe Jr}
 ((* endblock title *))
- 
+
 ((* block markdowncell scoped *))
+\setlength{\parindent}{0em}
+\setlength{\parskip}{0.5em}
     ((( cell.source | citation2latex | strip_files_prefix | markdown2latex(extra_args=["--chapters"]) )))
 ((* endblock markdowncell *))