2. See if swapon() failed and at least print a diagnostic.
3. Use -1 instead of strheight()/strwidth() everywhere.
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Try to reformat this code to be a little more human. Weird europeans
have been writing this, and can't even seem to agree a single coding
style for more than 4 consecutive lines! :-)
use dialog functions properly
move alloc_memory early to prevent core dump at stage 3
Change 25x80 to 24x80
Fix setenv diagnostic
Fix Fatal to call end_dialog()
