InfoVeg

It appears that mean cover reported for a community is the average of all the cover class values.

Changes, id needed:

1) Calculate cover only based on the plots in which the species is present -- do not include plots where not present. I think this is already the way it is done so probably no change is needed.

2) To calculate the mean, convert the cover values to the midpoints of their ranges and then average the midpoints and convert back to a coverclass (an integer value, not a decimal value).

The values to use for this calculation are as follows
1 = 0 - <0.1%
2 = .1 - <1%
3 = 1 - <2
4 = 2 - <5
5 = 5 - <10
6 = 10 - <25
7 = 25 - <50
8 = 50 - <75
9 = 75 - <95
10= 95 - 100