Solve bug con course block - refs BT#7210
Merge pull request #320 from AngelFQC/7210

Solve bug con course block - refs BT#7210
Fix deadlock condition in documents download
Merge branch '1.9.x' of github.com:chamilo/chamilo-lms into 1.9.x
Update INSTALL
merge
Fix download page link
A day has 86400 seconds, not 84600.
Merge remote-tracking branch 'upstream/1.9.x' into 1.9.x