tostring(e,[base])

[Dirk Laurie <dpl@...>]

At present Lua has `tonumber (e [, base])` but only `tostring (e)`.
For symmetry, `tostring (e [, base])` would be nice to have:

    F5 = 2^32+1
    p = 641 
    q = F5/p
    print (tostring(q,2)).."₂" --> 11001100011101110000001₂

Dirk