Closes #305.

This reverts commit f2ac01b9.

We still have to manually start image building jobs, and there is
no disadvantage to allowing rebuilding arbitrary images.

Latest versions of Kaniko builder use this new credentials directory

deprecate leaving 'norbs' unset

See merge request kwant/kwant!316

Closes #238

Closes #196.

use latest jupyter-sphinx and configure thebelab

Closes #306

See merge request kwant/kwant!308

add 'add_peierls_phase' utility function.

See merge request kwant/kwant!300

This function adds a Peierls phase to a Builder

this decorator will be needed in kwant/builder.py in the next
commit.

Modify tutorial to remove warnings.

In pytest v5 the behaviour of str(exc_info) changed. We now
use str(exc_info.value) as the canonical way of obtaining
the exception message.

Closes #304.

Implement Landau level discretization.

See merge request kwant/kwant!295

Tómas authored 5 years ago and Joseph Weston committed 5 years ago

Co-Authored-By: Joseph Weston <joseph@weston.cloud>

Previously when 'attach_lead' would expand a lead unit cell to deal
with greater than nearest-neighbor hoppings it would unset the
conservation law and discrete symmetries of the lead.

Closes #303.