in WIEWS dataset convert ORIGCTY in MCPD format

@slgora and @ColnKhoury unfortunately WIEWS dataset downloaded from the website has several fields in different formats as MCPD standard, WIEWS data sent by Stefano in the first batch did not have this issue. I dealt with most of them in a separate issue.

Here I want to highlight that the ORIGCTY field is in the wrong format, i.e. there is the full country name instead than the iso-code (for example Italy instead of ITA), we need to convert it to ISO-code format. @slgora can you draft a function that converts country name to iso code ( using as conversion table geo_names.csv. , which is in the folder /Support_files/Geographical ). ?