Remove angle brackets for proj headers #849
Using angle brackets in include directives increases the risk of accidentally picking up an older system installed header file while building an updated version of PROJ.
This PR changes the angle brackets to "" for proj.h, projects.h, proj_api.h and geodesic.h
* Avoid using angle brackets for PROJ headers. Switching from #include <proj.h> to #include "proj.h", and correspondingly for projects.h and proj_api.h, reduces the risk of accidentally picking up a system installed older version of the header while building a new version of PROJ. * Also handle geodesic.h