fixes in project description, exchange data for eod project

projects/project_stimulus_reconstruction/stimulus_reconstruction.tex

@@ -57,7 +57,7 @@ reconstruct the stimulus a neuron has been stimulated with.
     error using the mean-square-error and express it relative to the
     variance of the original stimulus.
     \begin{equation}
-      err = \frac{1}{N} \cdot \displaystyle\sum^{N}_{i=1}(x_i - \bar{x}),
+      err = \frac{1}{N} \cdot \displaystyle\sum^{N}_{i=1}(x_i - \bar{x})^2,
     \end{equation}
     with $N$ the number of data points, $x_i$ the current value and
     $\bar{x}$, the average of all $x$.