fixing bug when showing calendar events in groups -refs #6937
Minor - refactor code.
Minor - removing error_log.
minor fix in comment label -refs #6942
minor fix in comment label -refs #6942
changing yesno icon in survey -refs #6728
Updating vendors.
Disabling webrtc + using nanogong and then wami for record audio see BT#7339

The wav file is transformed in mp3 if the binary  ffmpeg is installed.
Use https when necessary
Use https when necessary
remove newline (added by github)
Merge pull request #205 from ycastillo/6942

minor fix in comment label -refs #6942
create/use main api functions
Merge pull request #207 from uppa/fix.pixlr

Fix pixlr : use https when needed
Fixing PHP warnings, adding intval.
Update Nanogong to version with certificate - refs #6940
Fixing PHP warnings.
Character encoding problem in test title - part 2 - ref #6933
Merge branch '1.9.x' of ssh://github.com/chamilo/chamilo-lms into chamilo19
Minor - format code.