Integrated Pipeline: ParsingResults now have an explicit field for the error message of failed parsing tasks

Integrated Pipeline: further rework of the CalculationParsingEngine tests to make them more flexible

Integrated Pipeline: refactored CalculationParsingFlow tests, added stream assertion for normal completion

Integrated Pipeline: ArchiveCleanUpFlow now removes temporary extracted files once all expected results passed through

Integrated Pipeline: merged parsing task/result messages into a single file to merge the start/end signals

-parsing and result signals now use the same start/end signal case classes to get rid of duplicate code
 and unnecessary transformations

-CalculationParsingFlow now uses the extractedPath field assigned by the ArchiveUnpackingFlow
-removed some tests for CalculationParsingFlow that are no longer needed

Integrated Pipeline: FileParsingTaskEndTree emitted by TreeParserFlow now includes the number of generated parsing tasks

-improved error messages given by findFirstMatchingStreamElement

Integrated Pipeline: element search assertion now takes matchers that work on a subset of the element stream only

-elements with non-compliant classes are automatically considered matching failures
-simplifies property matcher structure

Integrated Pipeline: skeleton implementation for ArchiveCleanUpFlow, simply forwards directory file tree based signals

Integrated Pipeline: CalculationParsingFlow test fixture inherits from StreamAssertions, renamed test sink/source

Integrated Pipeline: ArchiveUnpackingFlow now unpacks archives and adds extracted paths to parsing requests

-generalized some matchers
-FileParsingTask  now takes an optional argument for the extracted file path

Integrated Pipeline: improved readability of graph stage tests, more functionality for ArchiveUnpackingFlow

Integrated Pipeline: started to make tests more flexible by using builders and matchers instead of direct case class creation and comparison

Integrated Pipeline: declared end-to-end tests for command-line directory-parsing with multiple worker threads

-moved fixtures to package object to allow sharing between working and under development tests

-arguments for command-line invocation are now displayed in the test report

Integrated Pipeline: ParsingResultsProcessorFlow pulls next element before processing the current one