allow to read empty mif files, but warn; read IIASA xlsx snapshots

pik-piam / quitte

Bits and pieces of code to use with quitte-style data frames

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Closed orichters closed 5 months ago

orichters commented 5 months ago

allow to read empty mif files (return an empty quitte frame) then, but warn
as.quitte(NULL) returns quitte frame with 0 rows (is also useful if you have a list of magclass objects generated by readGDX, but one of them did not exist)
if IIASA snapshot is xlsx, don't grep around