Fixed name of libplumedKernel in modulefile with prefix

Before this fix, the PLUMED_KERNEL env var was erroneously not
containing the LIBSUFFIX value.

This fix is relevant only if one use at the same time PLUMED_LIBSUFFIX
*and* loads the module file, which is unlikely.

src/lib/Makefile

@@ -98,7 +98,7 @@ install-do:
 # copy inc files changing the path
 	for file in Plumed.inc* Plumed.cmake* ; do sed "s| $(realpath ../../)| $(PLUMED_INSTALL_ROOT)/|g" $$file > $(PLUMED_INSTALL_ROOT)/src/lib/$$file ; done
 # modulefile
-	@sed "s|@_PREFIX_@|$(PLUMED_INSTALL_PREFIX)|" modulefile.in | sed "s|@_SOEXT_@|$(SOEXT)|"> $(PLUMED_INSTALL_ROOT)/src/lib/modulefile
+	@sed "s|@_PREFIX_@|$(PLUMED_INSTALL_PREFIX)|" modulefile.in | sed "s|@_SOEXT_@|$(SOEXT)|" | sed "s|@_SUFFIX_@|$(PLUMED_INSTALL_LIBSUFFIX)|" > $(PLUMED_INSTALL_ROOT)/src/lib/modulefile
 # install links
 	ln -s $(PLUMED_INSTALL_ROOT)/src/lib/plumed $(PLUMED_INSTALL_PREFIX)/bin/plumed$(PLUMED_INSTALL_LIBSUFFIX)
 	for file in $(PLUMED_SCRIPTS) ; do ln -s $(PLUMED_INSTALL_ROOT)/src/lib/plumed-$$file $(PLUMED_INSTALL_PREFIX)/bin/plumed$(PLUMED_INSTALL_LIBSUFFIX)-$$file ; done

src/lib/modulefile.in

@@ -7,6 +7,9 @@ set prefix "@_PREFIX_@"
 # this is the extension for dynamic libraries
 # if set to empty, switches off plumed library
 set soext  "@_SOEXT_@"
+# this is the suffix to plumed executable and library
+# could be set to plumed version, but is usually blank
+set suffix "@_SUFFIX_@"
 
 # everything past this line should not need any editing
 
@@ -36,5 +39,5 @@ if { [module-info mode load] && [ info exists ::env(PLUMED_KERNEL) ] } {
 prepend-path  LIBRARY_PATH       $prefix/lib/
 prepend-path  LD_LIBRARY_PATH    $prefix/lib/
 prepend-path  DYLD_LIBRARY_PATH  $prefix/lib/
-setenv        PLUMED_KERNEL      $prefix/lib/libplumedKernel.$soext
+setenv        PLUMED_KERNEL      $prefix/lib/libplumed${suffix}Kernel.$soext
 }