Migrate `getDataPath` function and environment

From seinebasin2, rvgest and talanoahydro

changed milestone to %v0.1.0

assigned to @david.dorchies

added feature label

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created branch 2-migrate-getdatapath-function-and-environment to address this issue

mentioned in merge request !2 (merged)

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• Store the name of the package in config.yml (use same tag as in DESCRIPTION)
• try to read config.yml in current directory
• Go upstream until one find the PackageName.Rproj in the upstream directory structure to find a config.yml file
• Add a message for user config used with location of it
• Add a warning if write_results is TRUE

Look at this to find a way to get the configuration of the calling environment package: https://stackoverflow.com/questions/65635915/inside-an-r-function-how-do-i-access-the-calling-environment

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