Rework XFM Mapping

[stufisher]

I would like to refactor the xfm mapping table to be a bit more usable. I dont think anyone is using this so now is a good time to get the schema right. Rather than storing one pixel per row i would like to switch to storing the whole map as a compressed blob. If no one objects i will make a pull req with the changes

DROP TABLE IF EXISTS `XRFFluorescenceMapping`;
CREATE TABLE `XRFFluorescenceMapping` (
  `xrfFluorescenceMappingId` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `xrfFluorescenceMappingROIId` int(11) unsigned NOT NULL,
  `gridInfoId` int(11) unsigned NOT NULL,
  `dataFormat` varchar(15) NOT NULL COMMENT 'Description of format and any compression, i.e. json+gzip for gzipped json',
  `data` LONGBLOB NOT NULL COMMENT 'The actual data',
  `points` int(11) UNSIGNED DEFAULT NULL COMMENT 'The number of points available',
  `opacity` FLOAT NOT NULL DEFAULT '1' COMMENT 'Display opacity',
  `colourMap` VARCHAR(20) DEFAULT NULL COMMENT 'Colour map for displaying the data',
  `min` INT(3) DEFAULT NULL COMMENT 'Min value in the data for histogramming',
  `max` INT(3) DEFAULT NULL COMMENT 'Max value in the data for histogramming',
  PRIMARY KEY (`xrfFluorescenceMappingId`),
  CONSTRAINT `XRFFluorescenceMapping_ibfk1`
    FOREIGN KEY (`xrfFluorescenceMappingROIId`)
      REFERENCES `XRFFluorescenceMappingROI` (`xrfFluorescenceMappingROIId`)
        ON DELETE CASCADE ON UPDATE CASCADE,
  CONSTRAINT `XRFFluorescenceMapping_ibfk2`
    FOREIGN KEY (`gridInfoId`)
      REFERENCES `GridInfo` (`gridInfoId`)
        ON DELETE RESTRICT ON UPDATE RESTRICT
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

Changes to ROI

ALTER TABLE `XRFFluorescenceMappingROI`
    ADD `blSampleId` INT UNSIGNED NULL COMMENT 'ROIs can be created within the context of a sample',
    ADD CONSTRAINT `XRFFluorescenceMappingROI_FKblSampleId`
      FOREIGN KEY (`blSampleId`)
          REFERENCES `BLSample`(`blSampleId`) 
              ON DELETE RESTRICT ON UPDATE RESTRICT,
    ADD `scalar` VARCHAR(50) NULL DEFAULT NULL COMMENT 'For ROIs that are not an element, i.e. could be a scan counter instead';

And add XRF Composite, which is a map composed of three XRFFluorescenceMapping entries

CREATE TABLE `XFEFluorescenceComposite` ( 
    `xfeFluorescenceCompositeId` INT UNSIGNED NOT NULL AUTO_INCREMENT , 
    `r` INT UNSIGNED NOT NULL COMMENT 'Red layer', 
    `g` INT UNSIGNED NOT NULL COMMENT 'Green layer', 
    `b` INT UNSIGNED NOT NULL COMMENT 'Blue layer', 
    `rOpacity` FLOAT NOT NULL DEFAULT '1' COMMENT 'Red layer opacity',
    `bOpacity` FLOAT NOT NULL DEFAULT '1' COMMENT 'Red layer opacity',
    `gOpacity` FLOAT NOT NULL DEFAULT '1' COMMENT 'Red layer opacity',
    `opacity` FLOAT NOT NULL DEFAULT '1' COMMENT 'Total map opacity',
    PRIMARY KEY (`xfeFluorescenceCompositeId`)
    CONSTRAINT `XFEFluorescenceComposite_ibfk1`
        FOREIGN KEY (`r`)
            REFERENCES `XRFFluorescenceMapping`(`xrfFluorescenceMappingId`)
                ON DELETE RESTRICT ON UPDATE RESTRICT,
    CONSTRAINT `XFEFluorescenceComposite_ibfk2`
        FOREIGN KEY (`g`)
            REFERENCES `XRFFluorescenceMapping`(`xrfFluorescenceMappingId`)
                ON DELETE RESTRICT ON UPDATE RESTRICT,
    CONSTRAINT `XFEFluorescenceComposite_ibfk3`
        FOREIGN KEY (`b`)
            REFERENCES `XRFFluorescenceMapping`(`xrfFluorescenceMappingId`)
                ON DELETE RESTRICT ON UPDATE RESTRICT
    )
    COMMENT 'A composite XRF map composed of three XRFFluorescenceMapping entries creating r, g, b layers',
    ENGINE = InnoDB;