Add LXrandr to Fluxbox edition.

[tnmarktx]

Gives Fluxbox edition dual monitor support. LXrandr is easy enough to install even for a newbie, but a newbie may not know how to add it to the Fluxbox menu. Plus it will save the rest of us the time by having it in by default.

[gapan]

I don't see why not.

[ax]

There was because we had not considered the matter but at this point will be implemented in the next release