Fix and relax license section of the form

[nuest]

The ERC allows arbitrary text in the license properties, see http://o2r.info/erc-spec/spec/#author-and-license-metadata

A new version of o2r-meta can extract the license from an erc.yml: o2r-project/o2r-meta#100

"license": {
"text": "CC0-1.0",
"metadata": "license-md.txt",
"data": "ODbL-1.0",
"code": "Apache-2.0"
},

• make drop-down menus editable fields so users can enter any text
• fix loading of arbitrary text from the metadata coming from the API
• remove UI bindings license and instead add an uneditable metadata license fixed to CC0-1.0
• add short text to the license information, which includes a statement that the metadata license is set by o2r and accepted by the uploading user (it is CC-BY-4.0)

[nuest]

Currently the UI does not load extracted license information:

Snippet from Rmd header:

---
# ...
licenses:
  code: Apache-2.0
  data: "PDDL 1.0"
  text: CC-BY-3.0
---

Excerpt from metadata:

{
"id": "qXHgz",
"metadata": {
"o2r": {
"upload_type": "publication",
"title": "Reproducible Environmental Observations and Analysis",
"temporal": {},
"spatial": {},
"publication_type": "other",
"publication_date": "2018-08-08",
"paperLanguage": [],
"mainfile_candidates": [],
"mainfile": "main.Rmd",
"license": {
"text": "CC-BY-3.0",
"data": "PDDL 1.0",
"code": "Apache-2.0"
},
"keywords": [],
"interaction": [],
"inputfiles": [],

UI screenshot:

[MarkusKonk]

Dropdown and free text do not work.
It works if the license matches exactly the id of the license.json, i.e. ODC-PDDL-1.0 instead of PDDL 1.0 and CC-BY-4.0 instead of CC-BY-3.0

[nuest]

Then we cannot use a dropdown, or must provide both a free text field and a dropdown?

Solution for editable dropdowns:

• http://plnkr.co/edit/wDm2mbTqTsT1YC5H7UPy?p=preview
• https://stackoverflow.com/questions/41619490/angular-editable-dropdown-make-editable-based-on-selected-value