Reframe 2.3 release notes
API changes
* Sanity checking returns `True` if `sanity_patterns` are empty
* Introduction of `readonly_files` variable in `RegressionTest` API to allow symlinking of target files
* New `propagate` member variable of `ProgEnvironment` that enables/disables the propagation of compilation flags to the underlying `make` invocation
* Default value for programming environment flags is now `None`. See [Reference Guide](https://eth-cscs.github.io/reframe/reference/) for more information on the actual behaviour.
Framework
* More robust behaviour when no modules are loaded
* Support for virtual copying of directories
* Ability to invoke `make` without passing it the environment's flags
* Fixed sandboxing of system partitions
* Unit test and CI improvements
* Other bug fixes