Change semantics of MQTT topic for perf events: the mqttpart string in a perfevents group is only used as a place holder for the CPU id and determines the width to be used for the CPU id in the MQTT string.

This is the first batch of changes, more to come

  -introduce STRCMP macro
  -remove "Value not recognized" messages
Move logger instance from ConfiguratorTemplate to ConfiguratorInterface

Every sensor stores its full MQTT-topic now

Add possibility to compile with symbol DEBUG (use "make debug")
Minor fixes and improvements to debug-output

(former only one PerfCounter for all CPUs)
Add check if MQTT-Topic is assigned twice

Deleted test.c as it was just a reminder-file.
Add readme.txt as kind of (incomplete) documentation
Various TODOs remain. Also some polishing could be required.

Most of the code is copied from sysfspusher and adapted to match perfpusher
TODO: think of a suitable config-file-layout
TODO: insert new code to read perf-counters

Move configuration parser to new class Configuration. Add configuration parameters for IPMI session timeout and retransmission timeout.