labels: Create Latex input
In kardinal-eros/voucher: Create herbarium labels for vegsoup objects

Create file to be typesetted using LaTex.

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labels(x, file = "labels.tex", template, nrow = 3, ncol = 2)
label(x, pos, side, template)
pageLayout(x, nrow = 3, ncol = 2)

`x`	data.frame.
`file`	character. A output file name.
`template`	character. LaTex template (see `template`)
`nrow, ncol`	integer. Number of rows and columns in page layout.
`pos`	how to position individual label on page. See ‘Details’.
`side`	how to position individual label on page.

The function uses the textpos package to place individual labels on page. A 2 by 4 layout is predefined.

labels: calls the below listed function and save a file specified in file argument. The structure (layout) of a label is controlled by a template and the function expects to find some specific keywords. See (reference to extdata).
label: creates LaTex source for an individual label (a unique voucher).
pageLayout: creates a list of arguments that can be used along with the textblock environment provided with the textpos package ("\begin{textblock}{0.8}[side](pos)").