selective not to store the generated images about apophnia

[kristopolous]

a don't write option sounds fine ... and easy.

[luxlux]

It would be good to be able to turn off cache for one picture while calling it.

I always make some tries to find the right size. these tries will be never used again. sometimes i still exchange the original during this process, so i would need to delete all resized cached images by hand. also some live images (webcam) should better not be cached.

I don't really know C but I guess it should be easy done something like this:

adding after line 129

#define D_DISK  'd'

adding after line 138

 { D_DISK, "Disk" },

adding after line 683

case D_Disk:
    g_opts.b_disk = atoi(*pTmp + 1);
    break;