optimtool-2.6.2

Upgraded Traits:

• add p2t function to verify the input value named x_0 in optimtool.example.Lasso.py.
• adjust break epsilon to 1e-4 in optimtool.hybrid.*, shorten algorithms execution time.

see test_hybrid.py which solved the underling issue:

$$ \min x^2+2xy+y^2+2x-2y \\ \ \mathrm{s.t.} x \geq 0, y \geq 0 $$

with optimal points around (0, 1).