Merge pull request #421 from libtom/doc-fix

manual: don't mention obsolete MP_DIV_SMALL

doc/bn.tex

@@ -271,7 +271,7 @@ test was invoked.  If an error is detected the program will exit with a dump of
 numbers it was working with.
 
 \section{Build Configuration}
-LibTomMath can configured at build time in three phases we shall call ``depends'', ``tweaks'' and
+LibTomMath can configured at build time in two phases we shall call ``depends'' and
 ``trims''. Each phase changes how the library is built and they are applied one after another
 respectively.
 
@@ -298,22 +298,6 @@ You will also note that the header \texttt{tommath\_class.h} is actually recursi
 includes itself twice). This is to help resolve as many dependencies as possible.  In the last pass
 the symbol \texttt{LTM\_LAST} will be defined. This is useful for ``trims''.
 
-\subsection{Build Tweaks}
-A tweak is an algorithm ``alternative''.  For example, to provide tradeoffs (usually between size
-and space).
-They can be enabled at any pass of the configuration phase.
-
-\begin{small}
-  \begin{center}
-    \begin{tabular}{|l|l|}
-      \hline \textbf{Define} & \textbf{Purpose}                      \\
-      \hline MP\_DIV\_SMALL  & Enables a slower, smaller and equally \\
-                             & functional mp\_div() function         \\
-      \hline
-    \end{tabular}
-  \end{center}
-\end{small}
-
 \subsection{Build Trims}
 A trim is a manner of removing functionality from a function that is not required.  For instance,
 to perform RSA cryptography you only require exponentiation with odd moduli so even moduli support