Merge pull request #40 from chamilo/1.9.x

1.9.x
Merge pull request #41 from chamilo/1.9.x

1.9.x
Merge pull request #42 from chamilo/1.9.x

1.9.x
Merge pull request #43 from chamilo/1.9.x

1.9.x
Merge pull request #44 from chamilo/1.9.x

1.9.x
#6948 add message in multiple lp audio upload form when no items in lp
Merge pull request #45 from chamilo/1.9.x

1.9.x
Merge pull request #46 from chamilo/1.9.x

1.9.x
Correction for direct course login, see git comment

https://github.com/chamilo/chamilo-lms/commit/301fb962da7eb87ddb8eff15deee92804228fda1#commitcomment-5835012
format file
fix anonymous surveys -refs #6829
Correct add link in assessement that appear twice - ref #6602
Coding convention
Add option to hide group's forum in main forum tool -ref #6724
Merge pull request #47 from chamilo/1.9.x

1.9.x
Fix bug LP height of content_id  -refs #6033
Merge pull request #48 from chamilo/1.9.x

1.9.x
Making visible create course link in home page if teacher is logged in -refs #7061
Showing next button when a user is registered -refs #7061
Fill survey from email URL with code works with CAS enbled -ref #6875