ticket VS-49
add function get_url_file (use libcurl) and use this in upgrade sniffer
add configuration parameter curlproxy
add log start and stop livesniffer (if verbosity > 0)
Merge branch 'develop' of https://stash.voipmonitor.org/scm/vs/sniffer into develop
Merge branch 'develop'
9.4beta19
9.4beta19