Fix typos + add data file in data/debug according to shatelatex parallel.tex example

experimental/data/debug/circle2d_r3.fma

+8  3  2  1
+30   2  0  0
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experimental/include/scalfmm/tools/tikz_writer.hpp

@@ -18,7 +18,7 @@ template <class TREE>
 /// \brief export in TIKZ the leaves and their morton index
 ///
 /// Generate a tikz pictures od the non empty leaves and the
-///  grid full parent grig
+///  grid full parent grid
 ///
 /// \param filename name to store the tikz command
 /// \param tree to drow the leaf level