fix doc [skip ci]

+ ignore bak files generated by latexindent
+ silence latexindent

.gitignore

@@ -95,5 +95,6 @@ test_*.txt
 *.zip
 
 doc/pics/*.ps
+doc/*.bak*
 
 callgraph.txt

doc/bn.tex

@@ -444,8 +444,7 @@ libtommath.a).	There is no library initialization required and the entire librar
 \section{Return Codes}
 There are five possible return codes a function may return.
 
-\index{MP\_OKAY}\index{MP\_VAL}\index{MP\_MEM}\index{MP\_ITER}\index{M
-  P\_BUF}
+\index{MP\_OKAY}\index{MP\_VAL}\index{MP\_MEM}\index{MP\_ITER}\index{MP\_BUF}
 \begin{figure}[h!]
   \begin{center}
     \begin{small}

doc/makefile

@@ -43,7 +43,7 @@ manual:	mandvi
 # Its configuraion is well documented
 # http://mirrors.ctan.org/support/latexindent/documentation/latexindent.pdf
 pretty:
-	latexindent -w -m -l=.latexindent.yaml bn.tex
+	latexindent -s -w -m -l=.latexindent.yaml bn.tex
 
 clean:
 	rm -f *.idx *.toc *.log *.aux *.dvi *.lof *.ind *.ilg *.ps *.log tommath.tex