Substitutes DEBIAN_STYLE_LIBEXEC flag and manages location and name of lib and libexec folders on Debian/Ubuntu-based systems

No unit tests yet.

build superposable subsets. At least three atoms are required.
This scenario gets now checked and an error is thrown.

Vec3 from two Vec3List that are closest.

When a chain has been inserted in an entity with a ChainHandle as
argument, the name of the given ChainHandle has been used.
The chain then got subsequently renamed to the given name.
This can cause problems, if a chain with the same name as the
input ChanHandle is already present.

not tested yet.

to 1. Exit condition of for loop is now properly set.

Needs improvements. For example, distance differences should be always capped to cap_difference

This solves some problems that have been discussed in the devel
mailing list. btw: the hazel nuts were awesome!

avoid ambiguous implicit conversions

The template specialization for std::vector in Eigen/StdVector seems
to change the symbol generated for std::vector<geom::Vec3>, which can
lead to missing symbols in libost_mol_alg during linking or at runtime,
depending on the compiler. Adding the StdVector include also to
python export of svd superpose helps to generate consistent symbols.