MegaPaint file format

MegaPaint    *.BLD

1 word          image width in pixels [if negative, file is compressed]
1 word          image height in pixels
-------
4 bytes         total for header

??              monochrome image data [max. 1440x1856]
                uncompressed size = ((width+7)/8)*height

Compression scheme:

For a given control byte 'n':
  n = 0         : use the next byte + 1 times and repeat 0
  n = 255       : use the next byte + 1 times and repeat 255
  n>0 and n<255 : output n (literal)

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