Issue 60 ignore timezone

[kan-fu]

Partially fix #60

Besides the standard "YYYY-MM-DDTHH:MM:SS.SSSZ", the backend also supports "YYYY-MM-DD" and ISO 8601 duration format like "PT1M". This Pr does not fix the duration format. so this works

onc.getRawdata(
    {
        "deviceCategoryCode": "ACOUSTICTRANSPONDER",
        "dateFrom": "2025-04-01T23:59:00.000Z",
        "dateTo": "2025-04-02",
        "locationCode": "BACSG.AT1",
        "rowLimit":"3",
    },
    allPages=True,
)

but this does not work

onc.getRawdata(
    {
        "deviceCategoryCode": "ACOUSTICTRANSPONDER",
        "dateFrom": "2025-04-01T23:59:00.000Z",
        "dateTo": "PT1M",
        "locationCode": "BACSG.AT1",
        "rowLimit":"3",
    },
    allPages=True,
)

In fact getScalardata changes those datetimes to the standard format

onc.getScalardata(
    {
        "deviceCategoryCode": "ACOUSTICTRANSPONDER",
        "dateFrom": "2025-04-01T23:59:00.000Z",
        "dateTo": "PT10M",
        "locationCode": "BACSG.AT1",
        "rowLimit":"3",
    },
    allPages=True,
)

getRawdata should also do that. I will ask the developer to fix it.

I also changed the default value of showWarning to False. This is requested by our internal manager. Our backend gives some unexpected warnings, which confuses users. Turning it off until the issue is fixed.