hsize & vsize don't affect png image size

[Peter Leschev]

Hi,

           When generating png output, the actual png size defaults to A4, 
with the lily score using the hsize & vsize but cropped if larger than the 
A4 page size.

           png size should be defined by hsize & vsize

$ lilypond --png test-input.ly
GNU LilyPond 2.4.6
Processing `test-input.ly'
Parsing...
Interpreting music... [8][16][24][32][37]
Preprocessing graphical objects...
Calculating line breaks... [3][6][9][12][15][18][21][24][27][30][33][36][38]
Layout output to `test-input.tex'...
Converting to `test-input.dvi'...
Converting to `test-input.ps'...


Cheers,
Peter