MESSy/CLaMS: Get the source code (on JURECA)

The JURECA system is accessible via ssh:
```
ssh -X userid@jureca.fz-juelich.de
```

Load following modules:

module load intel-para 
module load netCDF-Fortran
module load Mercurial

Getting a copy of the source by ssh:

hg clone ssh://hg-messy@messy.fz-juelich.de/messy-2.54.0-clams [outdir]

Create a Mercurial configuration file .hgrc in your home directory to set your username:

# This is a Mercurial configuration file.
[ui]
username = Firstname Lastname <mailaddress>

Create and run configure file in messy main directory:
```
autoconf
configure
```
Compile all
In messy main directory:
```
make
```
Compile only basemodel CLaMS
In messy main directory:
```
make libs
cd messy/mbm/clams
make
```

To commit changes it is neccessary to add default-push in messy-dir/.hg/hgrc:

[paths]
default-push = ssh://hg-messy@messy.fz-juelich.de/messy-2.54.0-clams