Add REST web service for get personal messages - refs #7338
Count the messages from the last received message - refs #7338
Minor - Update PHPDoc - refs #7338
Get messages data from the last received message - refs #7338
Minor - Update PHPDoc - refs #7338
Generate api keys - refs #7338
Fix how to get the new messages - resf #7338
Update the getNewMessages method - refs #7338
Patch updated SCORM CSS Ref # B8904
Minor - Fix PHPDoc - refs #7338
Filter before calling a database method - refs #7338
Update the API key generator method - refs #7338
Remove unnecessary filters - refs #7338
Add links to the portal and messaging tool - refs #7338
Add webservices classes for autload - refs #7338
Minor - format code.
Merge branch '1.9.x' of ssh://github.com/chamilo/chamilo-lms into chamilo19
Don't force int values for global questions see BT#8659, BT#8896

Fixes 28116a520107536502b4cc92c62e65a7f763d7bd
Adding createDefaultAudioFolder in order to create the audio folder

See BT#6613
Minor - format code.