Checkpointing does not seem to work with Markov-modulated models

[GuyBaele]

The state file generated contains entries such as:
parameter treeModel.rootHeight 1 174.13024862028956parameter 0 1 8.413698630136878parameter ...
These '174.13024862028956parameter' entries can obviously not be parsed correctly upon loading the state file.

[GuyBaele]

Cannot reproduce - i.e. works fine - on my laptop (Mac OS X). It seems the println() statement on the PrintStream object does not generate a newline in the checkpoint file on the Unix system (CentOS 7.6.1810; kernel: 3.10.0-957.27.2.el7.x86_64). According to the Java documentation, the println() on a PrintStream object 'terminates the current line by writing the line separator string. The line separator string is defined by the system property line.separator, and is not necessarily a single newline character ('\n').'