grit mini-fix

Small fix for grit. The function that handles the extensions didn't add the extension-period as it should if no extension was given in the -o option. ‘-ofoo’ would result in things like foos and foosh.

This is a one-line fix, by the way. In /libgrit/pathfun.cpp, function path_repl_ext(), replace this:

    if(pext)
        strcpy(pext, ext);			
    else
        strcat(str, ext);
by this
    if(pext)
        strcpy(pext, ext);			
    else
    {
        strcat(str, ".");
        strcat(str, ext);
    }

This is not really a critical update. As long as there's an extension-period inside the -o option, or if there was no -o to start with, it should work fine as is.

grit mini-fix

The quantizer for true-color to paletted wasn't properly prepared for the BGR order that big-endian systems use. This has been fixed. As this has no effect on little-endian systems (such as the binaries that you can find here), only the source archive has been updated.