Practical Guide:
plot("filename")....; // plot something
bmp::print("file.bmp","");
// print it to a bmp file named file.bmp
// the second argument is the options to beps2bmp
This is a terminal derived from blopeps: first a blopeps file is
created, and then it is transformed to a bmp file using the beps2bmp tool of blop. The static
print(filename,opts) function of the bmp terminal
can be used to print the current canvas to a file specified by the
first argument, the second argument specifies the options to be given
to beps2bmp (see beps2bmp --help for help)