Fix to sort dirs correctly when no territory is loaded
Detail: FileCore is defined as a case insensitive FS (ie. MyFile can't coexist in the same directory as mYfILE). Prior to a territory being selected the BigDir binary chop sort would (via the Internat_UpperCase macro) abandon a directory search once it mismatched, and so would never find !Territory in order to select the territory in the first place. Have Internat_UpperCase use ASCII uppercase until that time. Admin: Based on a submission from Colin Granville, with modifications. Version 3.73. Tagged as 'FileCore-3_73'
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