Added some parallel_implementation chamter stuff.
Added some graph scripts.
Added some replicated distribution data.
Added some replicated distribution data.
Added a data folder .gitignore.
Update data .gitignore.
Did some spell checking. Added \FIG macro for figures.
Rejiggered graph data storage scheme in parallel_implementation.
Set ticks to exponential notation and renamed legends to "mpi and calculation", "mpi only" and "calculation only".
Added some text to parallel_implementation/preamble.tex. Updated Makefile with some graphs and graph generation stuff.