TravisCI is too old for ed25519, so it can't be tested correctly.

The old API was using []byte, but was changed to string without running
the tests again.
It also sets the variables from the configuration to make them work.
Maybe there is a better way to do this.

This commit adds the possibibility to use either the native golang
libraries or ssh-keygen to check public keys. The check is adjusted
depending on the settings, so that only supported keys are let through.

This commit also brings back the blacklist feature, which was removed in
7ef9a05588. This allows to blacklist
algorythms or keys based on the key length. This works with the native
and the ssh-keygen way.

Because of #2179 it also includes a way to adjust the path to
ssh-keygen and the working directory for ssh-keygen. With this,
sysadmins should be able to adjust the settings in a way, that SELinux
is okay with it. In the worst case, they can switch to the native
implementation and only loose support for ed25519 keys at the moment.
There are some other places which need adjustment to utilize the
parameters and the native implementation, but this sets the ground work.

fix dependency broken because xorm's API changed

Was using the wrong method and now uses the method which checks if
the avatar link is relative or not.

Convert mirrors to regular repositories

Admins and user itself sees private org relations on profile

Only show activities and repositories on the dashboard, that the user has access to

Remote repository path is renamed but does not delete
outdated local copy which still has old repository path
as remote.

Change main content area bg to white, keep area above tabs grey

Module httplib will be replaced a well done third-party package
soon, so remove its unused tests

Add default branch to repo payload

update .gopmfile to reflect git-module update

Updated to reflect version increment in commit 47adc0e.

Add install option for log path

Add the ability to run crond inside the Docker container

- Add the crond init script for s6
- Add the RUN_CROND configuration variable to setup crond
- Crond will not be run by default (hence the `down` file in the service directory)
- `start.sh` check if RUN_CROND = "true" || "1" and remove this file to tell s6 to run the initscript
- Resolves #2597

Remove local wiki copy on repo transfer. Fixes #2558

Bump git-module. Fixes #2589

Fix for server error on release page when a user deleted their account

When repository contains a Slack type hook,
it changes original payload content.

This patch fixes it by using a local object to store
newly created Slack payload instead of assigning
back to the same variable.