Merge pull request #38 from chamilo/1.9.x

1.9.x
#6948 add message in multiple lp audio upload form when no items in lp
Removing blank spaces at blank spaces in FIB questions -refs #6810
Removing blank spaces at blank spaces in FIB questions -refs #6810
Removing blank spaces at blank spaces in FIB questions -refs #6810
Indentation
Correction for direct course login, see git comment

https://github.com/chamilo/chamilo-lms/commit/301fb962da7eb87ddb8eff15deee92804228fda1#commitcomment-5835012
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
Fix bug LP height of content_id  -refs #6033
Solves Issue 7071
bug #6999 ref#32 #33 error #7054 chamilo support
Minor - Remove erroneous temporary links from commit
Merge pull request #251 from ycastillo/yoselyn.6810

Fix blank spaces issue in fill-in-the-blanks questions - refs #6810
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 PHP warnings.
Minor - format code.