reshape.long: Convert data in wide format to long format
In sboehringer/gwasWeighted: Weighted Bonferroni Correction in GWASs

Long format duplicates certain columns and adds rows for which one new column hold values coming from a set of columns in wide format. Does not allow for parallel reshaping.

reshape.long(
  d,
  vars = NULL,
  factorColumn = "factor",
  valueColumn = "value",
  factors = as.factor(vars),
  rowNamesAs = NULL
)

`d`	data frame with columns in wide format
`vars`	columns in wide format by name or index
`factorColumn`	name of the column to be created for the factor
`valueColumn`	name of the new column of values that were in wide format
`factors`	`vars` can be grouped. For each level of `factor` a new row is created. Implies that `length(vars)` is a multiple of `length(levels(factor))`
`rowNamesAs`	name of the column that should contain row names