Removed unused variables

See merge request !26

Fix acquisition loop to works correctly with base 7.0.5

See merge request !25

The change introduced by this commit
https://code.launchpad.net/~dirk.zimoch/epics-base/+git/epics-base/+merge/394327
on epics base changes the way the mutex works. Due to that the acquisition
loop when at 14Hz got in a wrong state:
When the state machine is going to RESET or INIT the acquisition loop tries
to arm the device, but on this situation the device cannot be armed and goes
to error state.

It is not clear which change on mutex changes this behavior, but it was
possible to fix the issue checking on loop acquisition on 2 different points
if the state machine was different then ON (the only state which the
acquisition should happen).

tests: Remove hardcoded prefix for IOCNAME

See merge request !24

Now is possible to run the tests for any system

Include a parameter to define if the LPS signal should be read

See merge request !23

Now the Device class set if a digitizer should read or not the LPS
Interlock signal. By default it will receive the signal.

For the snippets with more than 1 digitizer, always the 1st digitizer
is the one which will read the LPS interlock, and the others will
ignore them.

Remove check for interlock on transition OFF -> INIT

See merge request !22

This change avoid issues when the IOC starts with firmware on ERROR
state (this happens if the IOC is not finished correctly). Now the check
for firmware state is done at the end of EnterInit method.

Update tests

See merge request !21

Bug fixes

See merge request !20

The past limit was 1000, and was causing issues for larger tables

Change how conversion and calibration of down samp is done

See merge request !19

Instead of do the conversion and calibration of downsampled channel one after
another, now these part of code runs as a different thread (one per channel).
If when a new pulses arrive the previous one is not calibrated yet, it will
be throw away.

This change should avoid the issue when the LLRF got stuck after a fast
interlock.
This change should be temporary, as a new calibration procedure should be
implemented soon.

Re-organize the NELMs for waveform records

See merge request !18

Split NELM in AI, DWN, INT and CAL, so is possible to define each of them
specifically. Set smaller values as defaul for each of them, so is possible
to start the IOC allocating all the memory at the IOC startup.

Fixes on auto save and control table update

See merge request !17

There is no need to re-initialize the control tables every time there is a reset.
This way a lot of small issues are avoided.

Now the aux channel configurations are reloaded correct

Small updates and fixes

See merge request !16

Updates to fix cbLow ring overflow

See merge request !15

To avoid cbLow ring buffer full

Fix control table write thread

See merge request !14

It shouldn't exite when an error happen.

Fix writing table loop to release the "token" when some error happen

See merge request !13

This way the writting table is not locked

Limit tables to 50000 samples to avoid loose pulses

See merge request !12

Current setup doesn't allow to work on 14Hz, and write tables greater
than 50000 samples without loose some pulses.
This is a work around until the root cause of this is identified