test07: Change min value from -32768 to -32767, due to variable saturation block (-> symetric saturation).

- nb. remaining shots
- sampling frequency
- internal trigger test mode
- internal trigger threshold filter
- variable saturation (set to max at init)

-> fmc_eic and timetag core moved to mezzanine (behind bridge).
-> ddr addr and data (for svec) moved.

fmc_adc, many tests: Add sdb to fmc_adc class, use csr class for timetags reading, change trigger position to byte address (was sample address).