add HTTP(S)_PROXY and http(s)_proxy exports #45
Merged
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According to issue #43: curl, wget, perl library and python library read environment variables to configure http and https proxy. But the current curl uses upper case letters and the current wget uses lower case letters. (Found in the man pages.) The perl library could have changed the writing in the history. (Found different information on web pages.)
To support all tools in all versions HTTP(S)_PROXY and http(s)_proxy exports are added in the orc_loadURL function.
On Ubuntu 18.0.4 all four download tools work with this export definitions in a test.