Merge branch '15-add-structured-logging-and-output-levels-for-complete-module-2' into 'wip_tests_and_notebooks'

Resolve "add structured logging and output levels for complete module"

See merge request !8

-> modified script for testing

fixed a typo in toar_rest_client logging

now any handler and its formatter can be added
added possibility to pass all uncaught exceptions to the logging

Adopted two notebooks to use the new logging
used conversionOfTimestamps script for testing of auxillary class.

Merge branch '18-cache-and-requests-handling-of-dead-status-endpoints-internal-server-error-old-requests' into 'wip_tests_and_notebooks'

Resolve "Cache and requests: Handling of dead status endpoints (Internal Server Error, old requests)"

See merge request !7

added new version of cache and already added restart of requests when receiving  an internal server error

added info that also name of a variable can be used in addition to cf_standardname

minor typo fixes

Merge branch '17-handling-for-request-returning-a-shorter-daterange-than-requested' into 'wip_tests_and_notebooks'

Resolve "handling for request returning a shorter daterange than requested"

See merge request !5

added time to loging of requests to analysis service

now also works for retrieved data, that do not cover the full requested range

added script for testing of differnt timestamp ranges

added class to extract a list of valid metadata from the toar database
added testscript for this class

added notebook to use this new class to extract data for all stations between 2000 and 2018.

Resolve "coordinate ranges do not match"

See merge request !4

adopted test to use function of Grid class

now having coordinate axis with correct grid points

taking care of wrapping of data longitude

added test script with visual inspection of results