added gxrio as submodule

.gitmodules

@@ -7,3 +7,6 @@
 [submodule "libcifpp"]
 	path = libcifpp
 	url = https://github.com/PDB-REDO/libcifpp.git
+[submodule "gxrio"]
+	path = gxrio
+	url = https://github.com/mhekkel/gxrio.git

CMakeLists.txt

@@ -103,13 +103,22 @@ set(CMAKE_THREAD_PREFER_PTHREAD)
 set(THREADS_PREFER_PTHREAD_FLAG)
 find_package(Threads)
 
+find_package(gxrio QUIET)
+if(NOT gxrio_FOUND)
+	add_git_submodule(gxrio EXCLUDE_FROM_ALL)
+endif()
+
 find_package(cifpp 5.0.0 QUIET)
 if(NOT cifpp_FOUND)
 	add_git_submodule(libcifpp EXCLUDE_FROM_ALL)
 endif()
 
 add_git_submodule(date EXCLUDE_FROM_ALL)
-add_git_submodule(libconfig EXCLUDE_FROM_ALL)
+
+find_package(libconfig QUIET)
+if(NOT libconfig_FOUND)
+	add_git_submodule(libconfig EXCLUDE_FROM_ALL)
+endif()
 
 # The DSSP code is in a separate library, optionally to be used by others
 add_library(dssp_library OBJECT ${PROJECT_SOURCE_DIR}/src/DSSP.cpp)

gxrio @ a7bb5b5c

+Subproject commit a7bb5b5c4b6612215a78267b89e05c39a45429b5

src/dssp_wrapper.cpp

@@ -64,7 +64,7 @@ std::string ResidueToDSSPLine(const dssp::DSSP::residue_info &info)
 			code = 'a' + ((ssbridgenr - 1) % 26);
 	}
 
-	char ss;
+	char ss = ' ';
 	switch (info.type())
 	{
 		case dssp::structure_type::Alphahelix: ss = 'H'; break;