class-beadRegistrationData: Class "beadRegistrationData"
In beadarray: Quality assessment and low-level analysis for Illumina BeadArray data

A class for storing information relating to the registration of the image.

Objects of this class contain the following slots

`layout`:	A list entry containing details of the structure of a BeadChip. By default entries for the number of sections, the number of segments per section and a logical value stating whether the chip is two colour are created.
`registrationData`:	A list with length equal to the total number of segments registered. Each entry contains a vector of the differences between the within bead-type variances calculated using randomly assigned bead IDs and those calculated using the provided bead IDs.
`coordinateData`:	A list with length equal to the total number of segments registered. Each entry contains the coordinates of the beads assigned to the segment, taken from the .locs file.
`cornerData`:	A list with length equal to the total number of segments registered. Each entry contains a set of four coordinate pairs that mark the corners of the segment within it's image. These can be extracted from the `coordinateData` and this slot may be removed at a later date.
`p95`:	A numeric vector storing the 95th percentile of bead intensities within each segment.
`imageLocations`:	Character vector storing the location of the tiff images of the array. These are obtained from the sectionData slot of the `beadLevelData` object that was processed by `checkRegistration`, and are required for visualising the bead locations.
`metrics`:	A data.frame, where each line contains the appropriate entry from the Metrics.txt file. Currently not used, but may be later.