[PLAT-6856] Stage 1: Removing deprecated under CDS umbrella

This PR is a continuation of [REQS-666](https://opengamma.atlassian.net/browse/REQS-666), the item concerned is  [PLAT-6856](https://opengamma.atlassian.net/browse/PLAT-6856), which is to remove the rest of the deprecated methods from OG-Analytics and patch up the surrounding changes. This is the first stage of the sequence of patches required to do this.

The strategy used in removing the deprecated code is the same as that outlined in https://github.com/OpenGamma/OG-Platform/pull/262, please refer to it for details.

Some of the code not marked deprecated relates to CDS implementations that have since been replaced.