Add generation of ctags database for cdo/cdi

Rakefile

@@ -330,6 +330,13 @@ task :default do |t|
   sh "rake -sT"
 end
 
+desc "generate tags data base for vim amd emacs"
+task :tags do |t|
+  srcFiles = Dir.glob("src/**/*.{h,c}") + Dir.glob("libcdi/**/*.{c,h,cpp,hpp,f90,f}")
+  Parallel.map(["","-e"]) {|ctagsOutputMode|
+    sh "ctags #{ctagsOutputMode} #{srcFiles.join(' ')}"
+  }
+end
 # check connections {{{
 task :checkConnections do |t|
   pp Parallel.map(@userConfig["hosts"]) {|host, config|