checkUpdates: check some historical files for updates by DWD
Description
check whether the DWD has updated historical datasets.
That requires updateIndexes to be run by me.
If that is the case, the funtion will give a warning, otherwise a message.
Usage
checkUpdates(fast = TRUE)
Value
currently available files on the FTP server in the ca 34 historical folders, invisibly
Arguments
fast
only check a subset? currently ignored. DEFAULT: TRUE