convert docs for fixes eos/cv, eos/table/rx, gcmc, grem, langevin/spin, lb/fluid

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$$

   u_{i} = u^{mech}_{i} + u^{cond}_{i} = C_{V} \theta_{i}

$$

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\begin{eqnarray*}

   U_{i} = \displaystyle\sum_{j=1}^{m} c_{i,j}(u_{j} + \Delta H_{f,j}) + \frac{3k_{b}T}{2} + Nk_{b}T \\ 

\end{eqnarray*}                           

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