Fixes to build on openSUSE/Packman. (#67)

- Support different BINDIR, INCLUDEDIR and LIBDIR on install
- Take right python dir on x86_64 arch
- Fix build against Boost >= 1.58
- Make it possible to build libIfcGeom shared to reduce size of dependent binaries
- Fix INSTALL_RPATH
- Fix some more compiler warnings

src/ifcgeomserver/IfcGeomServer.cpp

@@ -58,7 +58,7 @@ std::string sread(std::istream& s) {
 	buf[len] = 0;
 	while (len++ % 4) s.get();
 	std::string str(buf);
-	delete buf;
+	delete[] buf;
 	return str;
 }