Changelog

Fixes and modifications for hydro_imgw() set of functions due to changes in the IMGW-PIB hydrological datasets
- adjusting code to recognize different encoding and directory structure
- adjusting changes in metadata
- removed option to download data for “semiannual and annual” time resolutions due to inconsistencies in the data
Fix unit tests for ogimet- and IMGW-related datasets
Resolving date formatting for hydrological data - the Date column represents calendar date
Corrected logic in downloading hourly OGIMET dataset

Major fixes for adjusting code to stay in line with CRAN policies
Corrected duplicated column names for IMGW-PIB stations
Adjusted encoding changes and documentation updates in meteo_imgw_telemetry_stations()

Corrected encoding problems for some of platforms where IMGW-PIB metadata were not parsed correctly
Added location of IMGW-PIB telemetry stations within meteo_imgw_telemetry_stations()
Minor bug fixes

Fix problems with downloading precip dataset from IMGW-PIB repository after recent changes in metadata
Bug fix for ogimet_daily if data contains more than one year

A new approach for handling CRAN policy for resolving problems if network issues are detected or some of the external services are temporarily down.
Adding allow_failure argument used by default that turns off automatic debugging but avoid warnings and errors for most typical use cases
re-factoring of unit tests
documentation build with CI/CD
updating vignettes and examples, including the way to use climate with Python

meteo_imgw family of functions supports multiple names as argument - bug fix
unit tests and code coverage computed with CI/CD
units added to column labels for nearest_stations_ set of functions instead of column names for easier processing (e.g. [km] are visible now only as attributes)
new functions follow lintr settings

Function spheroid_dist added to improve accuracy of calculations between points, but also avoid installing GIS dependencies (thanks to @kadyb)
Function nearest_stations_imgw() now uses the Vincenty’s formula in spheroid_dist to calculate the distance between points on a spheroid, not the Euclidean distance (previously results were inaccurate for some specific cases)
minor bugs fixes and improvements

Adding possibility to download BUFR vertical sounding dataset from http://weather.uwyo.edu/upperair/sounding.html; extra information with supporting example added to the sounding_wyoming’s documentation
hydro_imgw supports now exception for current year which has no flow data until it is verified by the IMGW-PIB
ogimet_daily automatically detects column names to be used for extraction in final data.frame; extra debugging info when temperature or precipitation columns are missing
minor changes in documentation (e.g. updated links to NOAA website)

Adding data.table package to read CP1250 on machines that do not support this encoding (translit used instead)

Changing URL danepubliczne.imgw.pl to dane.imgw.pl where needed
Fixing minor ogimet and IMGW bugs
Do not stop downloading data from ogimet.com, instead check for all available data in given period of time

Following CRAN policies
- Adding information if connection issues detected or URL no accessible
- RCurl dependency removal
- CO2 & Wyoming examplary data can be loaded offline

New dataset:
- Hourly NOAA ISH (Integrated Surface Hourly) data - global meteorological dataset dated back up to 1900

climate is independent of imgw package
Bug fixes
- #24
restored possibility of downloading single station from Polish (IMGW) repository

climate 1.2.2