HTTP: subselects: implemented auxiliary files
started to implement triggers. Broken and too tired to continue.
further implementation of triggers. Still troubles with XML format.
Subselect triggers work flawless
Unit test implemented. PEP-8 corrections. Debug-MSGs stripped.
Corrected status source from snmp to databus
minor performance tuning
Merge pull request #131 from creolis/http-variable-requests

HTTP: variable request trigger
fixed race condition in log worker

close #130
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