Trying to checkout an element that has no cached artifacts should be and
handled failure. See #447.

Handle checkout failure for unbuilt elements

See merge request !590

Phil Dawson authored Jul 02, 2018 and Javier Jardón committed Aug 01, 2018

This commit is part of the work required to resolve issue #436

Add Ubuntu install intructions

Closes #436

See merge request !525

HACKING.rst: Add running a single test example

See merge request !597

A project path is a path relative to a project directory.

A project path can not also refer to the parent directory in the first
path component, or point to symbolic links, fifos, sockets and
block/character devices.

The autotools example had to be copied over inside of the junction
example, as referring to a path outside of the project directory is
now disallowed.

Add validation for project paths

See merge request !593

This is required to be able to build a Loader before the list
of targets is known.

Fixes #331.

Add support for include in project.conf

Closes #331

See merge request !471

Add an optional flag to make files executable after having downloaded them.

Instead of leaving the permissioning of downloaded file in remote.py up
to the user's umask; expressly set permissions to 0644 or 0755 if
executable