Spell check Plotting/Fitting NB

Went through the plotting/fitting NB and spell checked everything.
Did a spell check for the Sim Plot example

Went through all of the markdown blocks and checked the spelling. Made a couple of small edits.
Spell checked the Parsing/Sim NB
Spell check histogram NB.
Spell Check Pandas Intro NB.
Spell check HDF/NetworkX NB

Also added a complete example at the bottom of the NB.
Finished up R/C/C++/Fortran example

I added Markdown to this notebook. Spell checked everything.
Comment and spell-check Advanced Pandas

Made spell-checked markdown comments for the Advanced Pandas example.
Commented Map example

Added spell-checked markup to Map notebook.
Added comments to Image NB

Spell-checked comments were added to the Image analysis notebook.