Little FR: increase read buffer for sliders

[mbncp]

1024 chars/line for the sliders is a bit small.
Either changing it to 16k or something or allow some symbol at the end of a slider line to let the parser know that the next line is part of the previous one.

Btw is there a way to fill an array like this:
myarray[]={12,45,78,89,...};

Thanks