The PDB does not allow atom coordinates maller than -999.999 or bigger
than 9999.999. Make sure, our PDB writer honors that restriction.

Solved conflicts:

	modules/io/doc/mmcif.rst
	modules/io/pymod/export_mmcif_io.cc
	modules/io/src/mol/mmcif_info.cc
	modules/io/src/mol/mmcif_info.hh
	modules/io/tests/test_mmcif_info.cc

exponential running time/ memory consumption. This problem only affected a
fraction of PDB entries.

naccess does not like dots in path names. Some temporary directories
contain dots, which causes naccess to fail. We now provide a scratch_dir
option, which allows to specify a temporary directory.

Also, allow to set the maximal number of atoms supported by naccess.

Fixes BZDNG-385

installation docu: mentioning fortran as requirement for TMTOOLS; fixing typos; fixing link to compoundlib docu

forgotten, before)

Fixes BZDNG-391

The ClashScore functions were not properly exported.
This is BZDNG-387

Fixes BZDNG-386

The examples don't really make a lof of sense without
shaders enabled