Change the parameter of the storeMessage, add tests for the spare field and small changes in the documentation

Formatting

Remove an unnecessary assertion and assign the currentBit

Added an error condition

Added tests for the spare field

Minor change in the documentation

Reimplement the spare field

Configure the step identifier for the reports about the progress of the execution of a request. The ErrorHandler has been updated

Added test basics

Implements #2

Fixes #1