separates DatasetsImpl -> DatasetsAmqp DatasetsCli

data-access/servlet/src/main/java/cutout/DatasetsAmqp.java

data-access/servlet/src/main/java/cutout/DatasetsCli.java

data-access/servlet/src/main/java/cutout/Reproject.java

data-access/servlet/src/main/java/webapi/ServletMCutout.java

data-access/servlet/src/main/java/webapi/ServletMerge.java

data-access/servlet/src/main/java/webapi/UWSMCutoutWork.java

data-access/servlet/src/main/java/webapi/UWSMergeWork.java

data-access/servlet/src/main/java/webapi/UWSSodaWork.java