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
fix anonymous surveys -refs #6829
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
Minor - fixing max-width.
Minor - fixing PHP notices.
Minor - format code.
Fixing qti import total question weight bug see BT#7780

Fixing export to QTI
Minor - format code.
Merge branch '1.9.x' of ssh://github.com/chamilo/chamilo-lms into chamilo19