Add default implementation of Composite_convergence_tester::max_iterations()
Use composite convergence tester in tower example
examples/module.mk: eliminate lattice code
examples/module.mk: add tower to STANDALONE_DIR

so that make distclean cleans the tower directory as well.
Promote Composite_convergence_tester to a template
src/module.mk: export composite_convergence_tester.hpp
remove support for a default parameter point
remove documentation of default parameter point
remove default parameter points from model files
adding default SLHA input file for the UMSSM
exit with an error message if no SLHA input file is given
more initialization
initialize all input parameters
fix SMSSM tests
split initialization of constraint state
fix NMSSM tests
consistent naming of input parameter setters
the SG cannot be run without a SLHA input file
Merge branch 'feature-no-default-pp' into development
adapt tower example spectrum generator to recent interface change