- Subsampling behavior with delta fixed: the deltas that
are sent over MQTT are coherent with the subsampling frequency, and are
computed separately from the local high-frequency deltas
- Added exception handling when writing to sensor file sinks
- Fixed odd ProcFS behavior that led to reading constant values from
certain files by closing and re-opening every time. Overhead seems to
be negligible

- Basic framework structure to perform streaming data analytics
on dcdbpusher
- Code currently compiles, but is not tested and integration with
dcdbpusher is still in progress
- Do not attempt to use this code yet :)

Fixing opening of MQTT connections again after the fix has been reverted during the latest merge. See 8b9bbaf7

- Now sensors can be configured to be automatically written to files
(sink param)
- A per-sensor subsampling feature has also been added, allowing to
decimate the frequency of readings sent to MQTT compared to those that
have been sampled
- Also fixed a bug in MQTTpusher that caused reduced message rates

Deleted plugins which were meant to be deleted. msr plugin may be needed later on, but in previous commit it is anyway not usable

- This allows for the correct operation of templated instantiation,
and all derived attributes on top of those from SensorBase are copied
- Added some minor visual feedback for qosLevel and maxMsgNum

- Fixed template management when configuring ProcFS and Tester instances:
sensors are not inherited from the template, preventing inconsistencies
- Fixed a bug that caused the "global" config block to be not recognized
anymore in plugins

- Allows to instantiate an arbitrary number of sensors which output
incremental values
- Naming and MQTT topic selection are performed automatically
- Useful to stress test the collectagent and verify overall performance