Display other representations of the results (exact, rational)

[lrq3000]

The app currently shows only the final result, even if it is an approximated result. It lacks the ability to show other representations of the result, such as exact results and rational numbers.

For example:

• solve2(10x=4y^2; sqrt(y)=1; x; y) will only show 0,4 instead of = 2 ∕ 5 = 0,4
• (-1)^(1/4) will show 0,707 106 78 + 0,707 106 78i instead of = ((1 + i) ⋅ √(2)) ∕ 2 ≈ 0,707 106 78 + 0,707 106 78i (so here we know it's an approximative result, but not in qalculate-android as of now).

I'm not sure where this issue is coming from, my hunch is in qalculate-android? If so, it should be easy to fix.

I think this is a critical issue to fix, because it drastically impairs interpretation of results, or can even be misleading when the approximative equal sign is not present.