chore: Added extern "C" to headers to avoid C++ name mangling
Initial import of ooC photon map
Removed redundant $Id: in file
Added missing RCSid forgotten during initial check-in
Double-counting bugfix for glow sources (thanks DGM!), revised copyright
Disabled use of SIGCONT if undefined (e.g. on WIN32), removed extra space in rpict reports after biascomp stats
Fixes for Windows and photon map
Initial check-in of photon map addition by Roland Schregle
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