Revised README after 20190119 meeting (Closes #31)
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This merge request is automatically copied from !578 (merged) orginally made by @floridop
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## Revised README after 20190119 meeting (Closes #31 (closed))
Description
Revised README after decisions taken in the 20190119 Skype meeting.
- detailed description in the commits
- Removed useless sections
- Rewrite so that external documents are linked
- Updated outdated information
@oxana Could you please review my text before MR approval?