aggr_share_of calculate the share of a group of entries in the
entirety of entries one level above, such as the share of plaice in
landings of a particular fishing fleet per year.
1  | aggr_share_of(data, id.vars, col, case, value)
 | 
data | 
 Dataset to use.  | 
id.vars | 
 A list of the variables to split data frame by, as as.quoted variables, a formula or character vector (similar ddply in package plyr).  | 
col | 
 Variable name that defines the case for which share is to be calculated.  | 
case | 
 Name of the case for which share in the entirety is to be calculated.  | 
value | 
 What to aggregate, i.e. calculate the share of?  | 
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