If the JPL database cannot be accessed, the creation of QcContext will fail when using rinex-cli

[vicalloy]

d0602bb#diff-67600567e036bbcbf6e0f241a23a11f60131adb0d7f1d30f3e2e9acd75b8efbd After this commit, creating CGGTTS will fail if there is no network access.

If the JPL database cannot be accessed, meta_almanac.process(true)?; will raise an error, causing the creation of QcContext to fail.

I see that you have added a QcContext::new_almanac, but it is not used anywhere.

Could you add a command parameter to rinex-cli to avoid network access?

[gwbres]

Hello,

thank you for helping improving our tools once again;

that's exactly what we're trying to avoid actually.. we should always be able to rely on an offline model.
I presume this scenario has not been tested yet, I'll give it a try tomorrow