Add support for Time Pattern

[SimonDelmas]

First of all, thank you for this very useful package.

I encounter an issue with HEC-DSS time pattern (which are described here). It is a special case of time series that is not associated with a specific time and differ from a regular time series by its "D" part of the pathname which is "TS-Pattern".
Catalog initialization always failed on with file that contains such data as it try to cast the D part into a datetime.

Support for TS-PATTERN would be appreciated. Ignoring them in the catalog creation to avoid failure in case the file contains this kind of data could be a simple first step.

Thank you for your attention to this issue.

Regards

[oskarhurst]

Hello @SimonDelmas, could you send me a DSS file that contains a HEC-DSS time pattern to use for testing.

[ktarbet]

The existing read/write methods use a zStructTimeSeries *tss. We would need to break down the tss into individual parts , times[], values[], like the other read/write methods for regular timeseries.

ztsStorePattern(long long *ifltab, zStructTimeSeries *tss)
int ztsRetrievePattern(long long *ifltab, zStructTimeSeries *tss, int retrieveDoublesFlag)

Also I think we would only return doubles for simplicity/consistency.

https://github.com/HydrologicEngineeringCenter/hec-dss/blob/master/heclib/heclib_c/src/SemiPublic/ztsStorePattern.c

[SimonDelmas]

@oskarhurst please find an example from an HMS simulation here.
Note that I have change the extension to bypass Github file upload policy.

Regards