#5605 Better support for long/longlong types in delimited text

[carolinux]

Added the ability to also infer long types (which up to now lost precision because they were cast as longs)
Tested it with a sample file and it works fine (also integer,double, text functionality still works fine)

[m-kuhn]

Could you add a test for this? The CSV provider already has a good test-suite. It would be great to have it also cover datatype detection.

[carolinux]

sure

[carolinux]

You'd like me to extend the python tests? There's no C++ tests. I can do that (polyglot :D), just making sure.

./tests/src/python/test_qgsdelimitedtextprovider.py

[carolinux]

test case added

[ccrook]

@carolinux That's great - just in the process of rebuilding development machine ATM, but looks fine .. will review and merge as soon as it is available.

[ccrook]

@carolinux I made a few changes to the code - mainly restoring some handling around empty values, and I think the type inference code was generating very large arrays couldBe... as they were being appended to for each row. Also I adapted your testlongs test to a more general type inference test, as I realised this was missing altogether in the existing test suite. Great to have this support built in.