Merge pull request #62 from chamilo/1.9.x

1.9.x
remove 'overwrite' comment
Solves Bug#7179

Solves problem editing password when username=email
Fixing hide buttons see BT#8417
Minor update docs + format code
Merge branch '1.9.x' of ssh://github.com/chamilo/chamilo-lms into chamilo19
Update changelog in prevision of 1.9.8.3
Merge branch '1.9.x' of github.com:chamilo/chamilo-lms into 1.9.x
check token to avoid CSRF - refs BT#7215
Fixing PHP warnings see BT#8440
Merge branch '1.9.x' of ssh://github.com/chamilo/chamilo-lms into chamilo19
Add Wodo Text editor sample  -refs BT#8274
Minor - format code.
Minor - Format code.
Hide shared_folder user not registered in the course see BT#8074
Merge pull request #324 from FraGoTe/7215

Check token to avoid CSRF in plugins activation - refs BT#7215
Minor - format code
Minor - format code.
Fixing custom pages link see BT#8339
Merge branch '1.9.x' of ssh://github.com/chamilo/chamilo-lms into chamilo19