deprecate sqrt_approx

[robertwb]

This is should be folded into the sqrt(...) function by passing a non-None prec. This exists, e.g. in sage.rings.Rational

Component: basic arithmetic

Issue created by migration from https://trac.sagemath.org/ticket/4611

[roed314]

comment:1

Attachment: 4611.gz

[malb]

comment:2

Patch looks good and doctests pass.

[sagetrac-mabshoff]

comment:3

Merged in Sage 3.3.alpha2.

Cheers,

Michael