RCG: Add a 'time_shift' parameter to ADC blocks in models.

Closes #296

See merge request cds/advligorts!265

'time_shift' is an integer.  For fast and low-noise ADC, 'time_shift' can range from 0 - clock_div (usually clock_div is 8).

Typically an IOP will read a fast or low-noise ADC 'clock_div' times per cycle.  With this change, the IOP will take 'time_shift' values from the previous cycle and

'clock_div' - 'time_shift' values from the current cycle, freeing more time to do other things in teh current cycle, but adding a bit of latency to the data.

For 16 bit ADC, time_shift can be 0 or 1.  When 1, ADC uses the value from the previous cycle.

In any case, 'time_shit' 0 causes the IOP to read all data from the current cycle.  For fast and low-noise ADC this can take the whole cycle.

Startup Sequencer: Make dolphin  drivers depend on dolphin port being active

See merge request cds/advligorts!264

Strengthen relation between dolphin driver and dolphin port control so that dolphin driver at least attempts an uninstall before port is disabled.

Also, make dolphin driver services part of dolphin driver target so that shutting down the target shuts down the drivers.

Filter out invalid messages that have the nanoseconds wrong for their cycle

See merge request cds/advligorts!263

 * Fix the checks in mbuf_probe gap_check to catch this case
 * Add a filter to cps_recv
 * Add an integration test
 * extend fe_simulation to simulate a timing glitch that sets the wrong nano-seconds value

RCG: Dolphin broadcast node changed from 4 to 252.

Closes #291

See merge request cds/advligorts!262

RCG: Dolphin broadcast node changed from 4 to 252.  This change allows node 4 to work like a normal node.

Exported Dolphin segments now properly unexported when there's an error farther down the line during initialization.

Some slight improvements to Dolphin initialization error messages.

 * Print out more timing information to help see if there is bad data.
 * Correct an existing debug output that was printing the cycle count instead of the nanoseconds.

RCG: Improve feedback from dolphin initialization.

See merge request cds/advligorts!261

startup sequencer: when START_MODELS is false, run startup sequencer, but...

See merge request cds/advligorts!260

startup sequencer: when START_MODELS is false, run startup sequencer, but don't link start_world.target to multi-user.target.  All the unit files should be created, but models, edc, local_dc and cps_xmit won't start.

GDSTP screen "IO" time modified to show most of ADC read time in microseconds.

Closes #280

See merge request cds/advligorts!259

Find name collision

See merge request cds/advligorts!258

MAX_IO_MODULES must match between io models, user models, awgtpman for MBUF datastructures to match.

The branch allows backporting some fixes to systems running 4.2.0 and older RCG.

awgtpman: stream and awg buffers now allocated based on model rate.

See merge request cds/advligorts!257

awgtpman: stream and awg buffers now allocated based on model rate.  This keeps memory usage low on slow systems, while allocating big enough buffers for fast systems.

fix x2sqz build failure related to goto->goto change

Closes #268

See merge request cds/advligorts!256

Some models have dangling "From" tags that are not linked to anything.  RCG now issues a warning and just deletes the tag.

RCG: add_line() used by remote_tags() in Parster3.pm now creates different 'Branch' and 'Line' objects as required by find_branch().  This change fixes remove_busses(), which was operating on the second segment of complex lines, but neede the first.