gcpy/benchmark/modules/benchmark_species_changes.py
- Added this script to compute a table of species that have changed
  between each version, along with corresponding metadata

CHANGELOG.md
- Updated accordingly

Signed-off-by: Bob Yantosca <[email protected]>

gcpy/benchmark/modules/benchmark_species_changes.py
- Add Pydoc headers
- Add code to generate the wiki tables for "Species added"
  and "Species removed"
- Print out the list of species with changed attributes (you then
  can use this info to manually create the table)
- Now use argparse to handle input arguments

Signed-off-by: Bob Yantosca <[email protected]>

gcpy/benchmark/modules/benchmark_species_changes.py
- Renamed function "create_wiki_tables"
  to "make_benchmark_species_changes_wiki_tables"

Signed-off-by: Bob Yantosca <[email protected]>

gcpy/benchmark/modules/benchmark_species.py
- Added a new line (\n) after the line with bgcolor, in order to
  have the table render properly.

Signed-off-by: Bob Yantosca <[email protected]>

gcpy/benchmark/modules/benchmark_species_changes.py
- Add "\n" after cellpadding in the first table header line
- Add bgcolor tag for each header column
- Now use proper Heading 3 tag ("=== ===")

Signed-off-by: Bob Yantosca <[email protected]>