- Now the percentages are computed based from the delta of each column
with respect to the last reading
- ProcstatPercParser renamed to SARParser for clarity
- New corresponding sensor group type is "sar"

- Sensors now support a "delta" field in config files. If set to "on",
differences between successive readings instead of the raw values will
be stored
- Default is "off"
- This option should only be applied to monotonic sensors
- Can be applied to perfevents as well

- At starting time, the actual MQTT message rate across all plugins is
computed and compared with the maxNumberOfMessages parameter
- If the latter is less than the former, the setting is ignored and no
message cap is imposed
- This prevents situations in which a low cap prevents readings
for some sensors from being sent, leading to missing data and potential
memory leaks
- The check is repeated any time the sensor config changes

- Now all sensors across all plugins adopt the naming convention
cpu<CPUid>.<sensorName>, if CPU-related, or just <sensorname> otherwise
- Code to parse cpu sets used both in Perfevent and ProcFS plugins
moved up in ConfiguratorTemplate
- Misc code to format MQTT parts also moved up in ConfiguratorTemplate

- This commit reflects changes made in the master branch and should
make the eventual merge less painful

- Added logic to compute a MemUsed metric, which corresponds to
(MemTotal - MemFree) for meminfo files
- To use this feature, a sensor of type MemUsed must be explicitly
defined in a meminfo sensor group in the procfs config file

- Parser and sensor group objects do not share the same sensor objects
anymore
- Sensor values are stored in the respective objects by the sensor
group itself, like in the other plugins

- Added a ProcstatPercParser: similar to ProcstatParser, for each CPU-related line it will collect for each column the percentage of the related value with respect to the sum of all columns, instead of raw values
- Can be selected by specifying sensor groups of type "procstat_perc"

- Reflects changes applied in the master branch