Merge branch 'master' into collected-small-fixes

make html         # generate HTML in html dir using Sphinx

make pdf          # generate 2 PDF files (Manual.pdf,Developer.pdf)

                  #   in this dir via htmldoc and pdflatex

                  #   in this dir via Sphinx and PDFLaTeX

make fetch        # fetch HTML doc pages and 2 PDF files from web site

                  #   as a tarball and unpack into html dir and 2 PDFs

make epub         # generate LAMMPS.epub in ePUB format using Sphinx

Installing prerequisites for PDF build

[TBA]

Same as for HTML plus a compatible LaTeX installation with

support for PDFLaTeX. Also the following LaTeX packages need

to be installed (e.g. from texlive):

- amsmath

- babel

- cmap

- fncychap

- geometry

- hyperref

- hypcap

- times

----------------

Installing prerequisites for epub build

\documentclass[12pt]{article}

\begin{document}

$$ 

  E = K (\theta - \theta_0)^2 + K_{UB} (r - r_{UB})^2 

$$

\end{document}

 No newline at end of file

\documentclass[12pt]{article}

\begin{document}

\begin{eqnarray*}

  E & = & E_a + E_{bb} + E_{ba} \\

  E_a & = & K_2 (\theta - \theta_0)^2 + K_3 (\theta - \theta_0)^3 + K_4 (\theta - \theta_0)^4 \\

  E_{bb} & = & M (r_{ij} - r_1) (r_{jk} - r_2) \\

  E_{ba} & = & N_1 (r_{ij} - r_1) (\theta - \theta_0) + N_2 (r_{jk} - r_2) (\theta - \theta_0)

\end{eqnarray*}

\end{document}

 No newline at end of file