Add error message for -format msh4

-format msh4 is not available with hex meshes.  Added clean error
message.

Author: rquey

VERSIONS

@@ -1,4 +1,4 @@
-New in 4.5.1-3 (02 Nov 2022):
+New in 4.5.1-4 (02 Nov 2022):
 - documentation: made minor improvements.
 - fixed truncated statistical distributions (from and to).
 

doc/conf.py

@@ -11,8 +11,8 @@
 import sphinx_rtd_theme
 
 project = u'Neper'
-version = u'4.5.1-3'
-release = u'4.5.1-3'
+version = u'4.5.1-4'
+release = u'4.5.1-4'
 author = u'Romain Quey'
 copyright = u'Romain Quey'
 language = 'en'

src/CMakeLists.txt

@@ -7,7 +7,7 @@ if(POLICY CMP0077)
   cmake_policy(SET CMP0077 NEW)
 endif()
 
-set(NEPER_VERSION \"4.5.1-3\")
+set(NEPER_VERSION \"4.5.1-4\")
 project(neper)
 
 if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.8.1)

src/neut/neut_mesh/neut_mesh_fprintf/neut_mesh_fprintf_msh/neut_mesh_fprintf_msh1.c

@@ -37,6 +37,10 @@ neut_mesh_fprintf_msh (FILE * file, char *dim, struct TESS Tess,
   {
     neut_mesh_fprintf_msh_entities (file, mode, Tess, Nodes, Mesh0D, Mesh1D, Mesh2D, Mesh3D);
 
+    if (!ut_string_strcmp (Mesh2D.EltType, "quad")
+     || !ut_string_strcmp (Mesh3D.EltType, "quad"))
+      ut_print_message (2, 3, "`-format msh4` not available with `-elt quad|hex`.\n");
+
     neut_mesh_fprintf_msh_nodes_v4 (file, mode, Tess, Nodes, Mesh0D, Mesh1D, Mesh2D, Mesh3D);
 
     neut_mesh_fprintf_msh_elts_v4 (file, mode, Tess, Mesh0D, Mesh1D, Mesh2D,