fccu_match_rows: Match the Length of a Data Frame and Vector
In kmorrisongr/fcan: Fc Array Analysis and Manipulation

Make data and vector same length/nrow as other vector. Remove entries from data and a until a is the same length as b. By checking if a[i] == b[i] until you find one that isn't.

1	fccu_match_rows(a, b, data)

`a`	A vector to be trimmed, must be from data as well (say, rownames()).
`b`	The vector of shorter length that you want length(a) and nrow(data) to be.
`data`	Some data frame you want trimmed.