Changed from using an environment variable to using a function interface for setting sdf_file_loaded

This bypasses the frustrating cases where a snap file (particularly safe.snap) doesn't set the right BURT_RESTORE variable.

RCG: some $target/chans directories if needed

See merge request cds/advligorts!324

Create chans/ipc/<IFO>.ipc if missing during build
Create chans/tmp if missing during installation

RCG: Modify default safe.snap to include DAC kill bypass time

See merge request cds/advligorts!323

Also, change defaults for DACKILL_PANIC variables to NORMAL, and BPTIME variables to 600 sec.

Backport of MR !320 !319 !316, updates to the slow controls SDF to not constrain monitored PVs to a specific prefix

See merge request cds/advligorts!322

 * Remove the prefix from the parsing of the req file.
 * Add a target to build the sequencer to the cmake, for testing purposes.

Closes #369

awgtpman: removal of old build flags that broak setting testpoints

See merge request cds/advligorts!321

We'd dropped an old build flag that was used to determine the element element size for test point numbers.

The testpoint size reverted from 4 bytes to t2, but only in the RPC definition.  As a result, only the first value in an RPC array of testpoints was in the correct position.  Only one testpoint could be specified correctly per test.

I've checked the rest of the code to make sure this was the only remaining use of the build flags.

Fast ADCs were reading only one point per cycle.  The ADC read loop limit was being reset to 1 for slow ADCs but not set back 1 for fast ADCs.

the 4-value dropouts seen on h1ioplsc0 fast adc channels ought to be fixed by this change.

RCG: Clear up all warning on slow control models

Closes #318

See merge request cds/advligorts!278

Tweaking types to make sizes correct for epics

See merge request erik.vonreis/advligorts!2

RCG: Remove html tags from all annotations

See merge request cds/advligorts!279

Except <br/> tags are replaced with newlines.

RCG: fix out of order calculations, add order check

Closes #325

See merge request cds/advligorts!276

rcg: Moved sequence check into /src/python dir.  Improved sequence error message.  Fixed some typos and formatting issues.

test is implemented as a python script in test/python_modules/sequence/

test compares the calculation sequence to the calculation graph.

The test is run during compilation after parsing but before building.  By default, a failure will kill compilation, but
if IGNORE_SEQUENCE_ERRORS=1 in the environment, only a warning will be issued and compilation will continue.

Two out-of-order bugs are fixed.

1. Ordering simply counts how many inputs of a part of visited. When that number matches the total inputs for the part, the part is visited,
but inside a subystem, delays were counted twice.  Once on the initial pass looking for signal sources, and again as a normal part.

Parts that took input directly from delays could appear early in the sequence.

This change skips following links form delays as a normal part.

2. If a data source, including subsystem inputs, constants, delays, grounds were connected directly to a subsystem output, then
parts immediately connected from the output would be added to the subsystem sequence, though they were at a higher level.

This bug could cause these parts to be sequenced out of order.

Change is to check whether a part leading form a data source is in the subsystem.  This check is already included when following from normal (non-input) parts.

rtcds improvements

Closes #234, #276, #312, and #319

See merge request cds/advligorts!274

awgtpman: now fails gracefully when IOP is not running

Closes #246

See merge request cds/advligorts!273