Image handling has been altered. Calling setImage() after the dialog is  already visible now changes the image. Does not die violently when  passed a null image filename. Also cleaned up init code.
Image handling has been altered. Calling setImage() after the dialog is 
already visible now changes the image. Does not die violently when 
passed a null image filename. Also cleaned up init code.


git-svn-id: 5afc437a751a4ff2ced778146f5faadda0b504ab@304 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

chototsu/MikuMikuStudio,chototsu/MikuMikuStudio,chototsu/MikuMikuStudio,chototsu/MikuMikuStudio