#342 negative values and oct/hex formats

[Sylwester Arabas]

GDL> print, -1, format='(O)'
37777777777

IDL> print, -1, format='(O)'
177777

GDL> print, -1, format='(Z)'
FFFFFFFF

IDL> print, -1, format='(Z)'
FFFF

[Sylwester Arabas]

This works correctly as of 0.9.8
Closing