Convert images of tables into tables

[phargogh]

Throughout the user's guide, we have a few images that are of tables that should probably be converted to actual tables (maybe even CSVs) for ease of translation:

./wave_energy/table_energyabsorption.png
./wave_energy/table_seastateoccurrence.png
./the_need_for/decison_context_table_small.png
./habitat_risk_assessment/criteria_csv.PNG
./coastal_vulnerability/NatHabRankTable.png
./habitat_quality/possible_threats.png
./wind_energy/wind_power_density.png