Improve json hpp install#1199

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NicolasToussaint wants to merge 7 commits intofossology:masterfrom

Orange-OpenSource:improve-json-hpp-install

Commits on Sep 4, 2018

fix(install-json-hpp.sh) make json-hpp download more robust to network errors:
NicolasToussaint
committed
fix(install-json-hpp.sh) Read proxy config from new configuration file
NicolasToussaint
committed