Merge pull request #186 from smirfolio/master

MICASERVER-123
Do not show charts with only one value
Merge pull request #187 from obiba/charts-fix

Do not show charts with only one value
Robustness of country display
list-page style
Download coverage button added
No coverage pie chart if only one data
Merge pull request #188 from obiba/demo-fixes

Demo fixes
Page dataset Details filter and paginate on harmonization table variables