chebfun/chebfun — pull request #1229 by aaustin141 (2014-10-22 16:47:13+00:00)
Title: Remove "cosmetic" (?) thresholding line from chebfun.roots().

This closes #1200. With this line in place, we can get bizarre things like the following:
```
>> f = 1e18*chebfun(@(x) x - 1.5e4, [1e4 2e4])
f =
chebfun column (1 smooth piece)
interval length endpoint values
[ 1e+04, 2e+04] 2 -5e+21 5e+21
Epslevel = 1.238223e-15. Vscale = 5.000000e+21.
>> roots(f)
ans =
0
```
Note that the point 0 isn't even in the domain of this chebfun!

An alternative to removing this line like we do here would be to eliminate the dependence of the threshold on vscale.