import_array() must be called when the numpy C-API is called.
This is a macro that in our case defined a return value that makes
the compiler complain. The added #define statement enforces no return value

Fixes the error "ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()" in AddMesh.

wrong branch, big sorry

This reverts commit e77d08a6.

fixed some DLLEXPORTs for exceptions
based ost:Error on std::runtime_error (avoids string member in ost::Error)

PrimList now contains four specific rendering primitives: points, lines,
spheres and cylinders; lines and cylinders accept two different colors
for each endpoint, and cylinders support two different radii for their ends.
The rendering mode no longer has any effect, also, it is no longer possible
to change the radius of spheres and cylinders once they are added.

The python interface is much more sophisticated, using named arguments
for optional parameters.

The low-level cylinder routine in IndexedVertexArray was adjusted
accordingly

changed cmake scripts to allow building as subproject / moved common configuration from startup scripts to separate script

git-svn-id: https://dng.biozentrum.unibas.ch/svn/openstructure/trunk@1813 5a81b35b-ba03-0410-adc8-b2c5c5119f08

git-svn-id: https://dng.biozentrum.unibas.ch/svn/openstructure/trunk@1810 5a81b35b-ba03-0410-adc8-b2c5c5119f08

git-svn-id: https://dng.biozentrum.unibas.ch/svn/openstructure/trunk@1742 5a81b35b-ba03-0410-adc8-b2c5c5119f08