add script to generate xml TGZ file

[pwittich]

closes #222

when make release is called, this will cause a new tgz file to be created that has the right format so it can be installed in /fw/CM on the Zynq.

On the zynq:

[cms@cmsapollo214 ~]$ tree /fw/CM/CornellCM_MCU/
/fw/CM/CornellCM_MCU/
└── address_table
    ├── address_apollo.xml
    ├── address_apollo.xml~
    ├── connections.xml
    ├── connections.xml~
    └── modules_CM_MCU
        ├── modules_CM_MCU -> modules_CM_MCU
        ├── PL_MEM_CM_old.xml
        ├── PL_MEM_CM_rev2.xml
        └── PL_MEM_CM.xml -> PL_MEM_CM_rev2.xml

2 directories, 8 files

This PR generates a tgz file as follows:

(base) [tmp] tree CornellCM_MCU               11:23:42  ☁  xml_release ☂ ⚡ ✚ ✭
CornellCM_MCU
└── address_table
   ├── address_apollo.xml
   ├── connections.xml
   └── modules_CM_MCU
      ├── PL_MEM_CM.xml -> PL_MEM_CM_Rev2.xml
      ├── PL_MEM_CM_rev1.xml
      └── PL_MEM_CM_rev2.xml