1. Check for nullptr if metadata is set. 2. Changing scaling_factor to be multiplied instead of divided (dcdb nomenclature).

Removing puning of ints to doubles and viceversa, and implementing use of scaling factor from metadata

- Especially useful in Collect Agent: now there is no need to restart
the CA to instantiate operator plugins after sensors have been
published

- Collectagent uses published TTL values and caches received metadata
- READMEs updated accordingly

- Also added a "pattern" field to SensorMetadata class for consistency
with the DCDB::PublicSensor class

- Data is correctly parsed from DCDBPusher, sent as JSON, and received
by collectagents
- Integration in libdcdb is still pending

SMUCNGPerf Operator: implementing memory bandwidth. PerSystSql Operator: fixing issue with one unit not being present, and no calculation was done.

- Reflects new hierarchical design
- Updated job_aggregator example configuration

- This is meant as a proof of concept of how the new flat/hierarchical
unit system can be configured to obtain different results
- Output sensors in sub-units contain the respective query counter, whereas
the top-level unit's output sensor contains a global query counter

- Hierarchical units are now supported across the framework in all plugins

- The configurator now accounts for hierarchical units
- Added checks in existing plugins to enforce flat/hierarchical units
- DISCLAIMER: this has likely broken the framework until I refactor OperatorTemplate

- Added generateFromTemplate method
- Fixed handling of special cases (on-demand and root units)
- Added enforceTopics option to force a MQTT prefix for unit outputs
- printConfig in UnitTemplate now accounts for hierarchical units
- Updated README

- Streamlined the public interface
- Added methods for single and multiple unit generation (plain and hierarchical)
- Added methods to automatically tell whether to build plain or hierarchical units
- Added pointer to parent in UnitTemplate
- Added methods to distinguish top and subunits in UnitTemplate

Adding all metrics to the configuration. Please NOTE: This invalidates the previous configuration files. The names for each metric have changed and are now standard to the type Metric_t in SMUCSensorBase.

- Now throws invalid_argument instead of domain_error

- Integrated the "disabled" parameter for operators
- "operatorPlugin" can be left empty if path and config are default
- "operatorPlugin" config field is relative to _cfgPath if not absolute
- Relaxed the operator name uniqueness constraint, duplicated operators
now have (again) all the same name
- Minor bugfixes

Fixing small bug in configurator. SMUCSensorBase: giving numbers to all Metrics (these will be used in the database as ids). Operator: changing some logs.