Implement 703/714 selection

[vbonvin]

Use rdbimport as a basis (see in utils.py and obs.py), and add selection criterias:

• [x] Moon distance
• [x] Delta V (ask Luc for the formula ?) #4
• [x] Airmass
• [ ] Previous observations (add a link to Damien's plots ?) #5
• [x] Meteo (clouds, winds, etc...)

[vbonvin]

outdated