read.coverages: Helper function to read coverages from file system
In ioncopy: Calling Copy Number Alterations in Amplicon Sequencing Data

Coverages are read from tab separated files and stored in a coverage matrix. All coverage files need to refer to the same panel of targets.

1	read.coverages(chip.names, file.names, anno.col="Target")

`chip.names`	A character vector comprizing the chip names.
`file.names`	A character vector compizing the names of tab separated files. Each file should contain the coverages of the same sequencing panel (rows) in a cohort of samples (columns).
`anno.col`	The column in input files that compizes the names of the targets. The targets must belong to the same sequencing panel for all input files.