Add generic positioner

[stufisher]

I would like to add a generic positioner table, and allow it to link to sample, and subsample. There are other tables to do this but they are very specific, i.e. motorpositions. I would like to create something much more generic and reusable.

CREATE TABLE `Positioner` ( 
    `positionerId` INT UNSIGNED NOT NULL AUTO_INCREMENT, 
    `positioner` VARCHAR(50) NOT NULL, 
    `value` FLOAT NOT NULL, -- debatable, varchar?
    PRIMARY KEY (`positionerId`)
    ) 
    COMMENT 'An arbitrary positioner and its value, could be e.g. a motor. Allows for instance to store some positions with a sample or subsample'
    ENGINE = InnoDB;

CREATE TABLE `BLSample_has_Positioner` (
    `blSampleHasPositioner` INT UNSIGNED NOT NULL AUTO_INCREMENT, 
    `blSampleId` INT UNSIGNED NOT NULL, 
    `positionerId` INT UNSIGNED NOT NULL, 
    PRIMARY KEY (`blSampleHasPositioner`),
    CONSTRAINT `BLSampleHasPositioner_ibfk1`
        FOREIGN KEY (`blSampleId`)
            REFERENCES `BLSample`(`blSampleId`)
                ON DELETE RESTRICT ON UPDATE RESTRICT,
    CONSTRAINT `BLSampleHasPositioner_ibfk2`
        FOREIGN KEY (`positionerId`)
            REFERENCES `Positioner`(`positionerId`)
    ) ENGINE = InnoDB;

CREATE TABLE `BLSubSample_has_Positioner` (
    `blSubSampleHasPositioner` INT UNSIGNED NOT NULL AUTO_INCREMENT, 
    `blSubSampleId` INT UNSIGNED NOT NULL, 
    `positionerId` INT UNSIGNED NOT NULL, 
    PRIMARY KEY (`blSubSampleHasPositioner`),
    CONSTRAINT `BLSubSampleHasPositioner_ibfk1`
        FOREIGN KEY (`blSubSampleId`)
            REFERENCES `BLSubSample`(`blSubSampleId`)
                ON DELETE RESTRICT ON UPDATE RESTRICT,
    CONSTRAINT `BLSubSampleHasPositioner_ibfk2`
        FOREIGN KEY (`positionerId`)
            REFERENCES `Positioner`(`positionerId`)
                ON DELETE RESTRICT ON UPDATE RESTRICT
    ) ENGINE = InnoDB;