MESSy/CLaMS: Get the source code

Mercurial repository:

https://messy.fz-juelich.de/hg/messy-2.54.0-clams

Getting a copy of the source:

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>

Add the bin subdirectory of the installation directory of MPICH library to your path:
```
PATH=/usr/nfs/software/icg1/local/mpich-3.2.1-ifort-18.0.3/bin:$PATH
export PATH
```
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
```