Order of fleet and season were backwards in dummy data within change_bin

Season should come first and then fleet.
Modify get_bin_info with code from Sean

Remove all if statements because each type of data information
should already exist.
Change the name of the dataframe and return the proper data frame.
Use lapply as a forloop rather than using eval.
Basically the entire function changed code wise but the output is the same.
Found error that was removing mean length at age

Instead of the wrong data being referenced, the mean length at age was
not passing a wrong test. The test is now fixed with this commit.