Update CoolReader to 3.1.2-50 (870)
Merge branch 'CoolReader' into 'master'

Update CoolReader

See merge request !357
New app from IIT Bombay research project CARTS
Update Exodus to 0.9 (40)
Update SMS Backup+ to 1.5.6 (1539)
SMS Backup+: Clearly mark 1.5.6 as pre-release.
Merge branch 'master' into 'master'

New app for research project

CARTS Bus Boarding

See merge request !358
Carts Bus Boarding: Use commit adding the license for build.
Carts Bus Boarding: Tags pushed.