License is LGPL, but current cmake config creates a static library on Windows

[rconde01]

Statically linking violates the LGPL in the case the library is linked with proprietary code and the source of the proprietary code is not delivered:

http://stackoverflow.com/questions/10130143/gpl-lgpl-and-static-linking

For this reason, it probably makes sense to change the default cmake config to generate a shared library on windows. Since this is already the case for non-windows platforms, I would guess the issue is maybe that symbols aren't exported by default with Visual Studio and it was not desired to decorate the classes. In this case, cmake has a solution:

https://cmake.org/cmake/help/v3.4/prop_tgt/WINDOWS_EXPORT_ALL_SYMBOLS.html

Another alternative is to make an exception in the license (although I'm unsure if gpstk is using other LGPL code that would prevent this).