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- The MQTT topic of a sensor is now used to identify the file name of the
sink and is appended to the path given as input

Change perf-plugin implementation: Instead of duplicating sensorGroups per CPU only one group is used with duplicated sensors

- Auto-publish is now case insensitive with respect to the <sensor> and
<group> patterns
- If an invalid pattern was specified (missing <sensor> clause) the
configuration is aborted
- Checks for the uniqueness of sensor and group names have been
temporarily dropped as they interfere with templates and entities
(until we find a good solution for MQTT topics)

- Added some more indentation to make the configurations more readable
- Fixed one more warning in dcdbquery

- Boolean configuration options now all accept "true" and "on" keywords
- Cache interval and thread count parameters removed from the command-line
interface for consistency; these can still be set in the config files
like all other parameters
- global.conf file renamed to dcdbpusher.conf for consistency

- Checks on MQTT topics have been made generic in the MQTTChecker singleton
class under "common"
- MQTT topic checks are now performed also when plugins are reloaded; if
the checks fail, the plugin is cleared and left uninitialized
- All sensors in a plugin not satisfying the checks are logged now, not
only the first one
- Fixed a minor bug that resulted in msgrates of 0 under certain
compilers, due to type promotion in C++

- Added a 'common' directory where all shared code has been placed
- Analytics package has been moved out of dcdbpusher, now has its own makefile
- Some renaming here and there for uniformity