Implemeenting PDF in 6x9 format.

I did the work on chapter 1 just to start somewhere. Trying to make
the book fit nicely on a 6x9 book format.

pdf/6x9build_book.bat

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+copy /Y  ..\01-g-h-filter.ipynb book.ipynb
+
+ipython nbconvert --to latex --template book6x9 book.ipynb
+ipython to_pdf.py
+REM move /Y book.pdf book6x9.pdf

pdf/book6x9.tplx

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+% Inherit from report
+((* extends 'report.tplx' *))
+ 
+((* set cell_style = 'style_ipython.tplx' *))
+
+((* block margins *))
+\geometry{verbose,papersize={6in, 9in}, tmargin=.5in,bmargin=.5in,lmargin=.5in,rmargin=.5in}
+((* endblock margins *))
+
+((*- block in_prompt -*))
+\mbox{ }\\ \\
+{In [{}(((cell.execution_count)))]:}
+((*- endblock in_prompt -*))
+
+((* block input scoped *))
+    ((( cell.source | highlight2latex )))
+((* endblock input *))
+
+
+((* block output_prompt *))
+\mbox{ }\\
+Out [{}(((cell.execution_count)))]:
+((* endblock output_prompt *))
+
+
+((* block docclass *))
+\documentclass{book}
+\setcounter{chapter}{0}
+((* endblock docclass *))
+ 
+((* block preamble *))
+((* endblock preamble *))
+ 
+((* block title *))
+\title{Kalman and Bayesian Filters in Python}
+\author{Roger R Labbe Jr}
+((* endblock title *))
+ 
+((* block markdowncell scoped *))
+    ((( cell.source | citation2latex | strip_files_prefix | markdown2latex(extra_args=["--chapters"]) )))
+((* endblock markdowncell *))
+