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This commit had to be rebased and appears out of chronological order.

TimeSeriesCollection does not need explicit constructors.

This allows random access.

Let shared libraries contain an soname as well as dynamic linker references to
other shared libraries they depend on. This was not yet provided in most
cases. The references to other shared libraries for example are required, when
using ctypes in python to access the API of a C++ library.

Three of five engines are not yet implemented and only drafted in the source
code. This now is made clear in the comments to the declaration of engine
classes and in the group of engines.

The documentation of the source time function in terms of the hard-coded
function f'(t) on the one hand and our understanding of a source-time history
on the other hand was confusing. Hopefully this is resolved now.