mbuf_probe, awgtpman, fron end: new testpoint mbuf added

awgtpman: new mbuf for testpoint control added. It's just a big array of integers. Distinction between fast and slow models erased in the mbuf, and mostly erased in the awgtpman internal data structures. New mbuf uses TESTPOINT_CFG struct overlay on a memory map, similar to the AWG_DATA mbuf.

mbuf_probe: TESTPOINT_CFG added as analysis type. Just prints out the first few testpoints over and over. Fixed some calls to shared memory that were passing bytes when they should have passed megabytes.

front_end: opens new testpoint mbuf and uses it for test point control. Gets rid of need for offset calculations.