SLSMF/API-Documentation: API v2.1 - Research data adjustments

Breaking changes for /v2/research/stations original_stime is replaced by fit_to_sample_rate, which aligns the data to the sample rate, by adding extra records with slevel is set to NA and qc flag missing. Timestamps are rounded down to the expected time of measurement based on the sample rate. level_data renamed to substract_30d_average Filters no longer remove records, only set slevel to NA For DART buoys without includesensors[]=prt, prte is now added to prt Other changes for /v2/research/stations maximum lowered for days_per_page from 3650 to 365 flag_qc now shows new columns: missing, distinctness, completeness, shift New filters added: filter_completeness, filter_distinctness, filter_shift on day level. Previously this was applied by default. Data changes Clean up of research data by removing non-sealevel measuring sensor types: bat, prd, sw1, sw2, atm