Merged requested to merge a_cassinelli/nektar:ticket/backup_checkpoint_209 into master
NEKTAR_DISABLE_BACKUPS in CMake is no longer used for enabling or disabling the backups.
The alternative approach proposed in this branch is to disable the writing the backups in one of two ways:
a command line option
--forceoutputto be consistent with the existing option inside
setting an environment variable (NEKTAR_DISABLE_BACKUPS) to overwrite the backups' behaviour. The user could use the following command in the terminal to disable the backups:
$ export NEKTAR_DISABLE_BACKUPS=1
While this environment variable exists, it will prevent backups from being written.
Closes #209 (closed).