Pyquaero

* `powerconsumption.power` was off by two decimals, should be fixed now (DrTron)

* Reported currents were too high by a factor of 10, fixed. (Reported by DrTron)
* Some `null` values were not properly detected.

* Added support for firmware versions 1028 to 1030. Note that on these firmware versions, pyquaero is unable to set the time, and an exception is raised instead.
* Added support for firmware 2007 (and probably other firmware versions in the 2000 range).
* Tested firmware support up to the current version 2104.
* Fixed the flow meter status on structure version 1200. The bug affected all firmwares starting from version 2007.
* Added a new tool `pyqread` for reading the current status, settings, and the customizable string from command line to stdout.
* `pyqmdump` does not dump the flash memory by default, which makes it safer for use.

A big shout-out to DrTron for sending dump files and for the testing.

* Added support for firmware 2101.
* Structure version is used instead of the firmware version, so pyquaero can address a lot more firmware versions now. However, these firmware versions are then untested and may bring wrong results.
* Added `pyqmdump`. This tool dumps the current status, settings, and the contents of the flash memory. It will help with remote debugging and supporting new firmwares.

* Added support for firmware 2100.
* Some minor bug fixes.

Aqua Computer generously donated an Aquaero 5 for development purposes. Thank you!

* Fixed an error that always appeared on command completion.