Argument Parsing

- Obsoleted Command::exectute  'commandLine' argument.  It is worse
  than unnecessary, it is an uncategorized raw argument string, which
  is only really useful for the 'execute' command, which itself now
  calls Arguments::combine to reconstruct the command line string.

src/en-US.h

@@ -108,6 +108,9 @@
 #define STRING_CMD_SHOW_CONF_VAR     "Config Variable"
 #define STRING_CMD_SHOW_CONF_VALUE   "Value"
 
+// Config
+#define STRING_CONFIG_OVERNEST       "Configuration file nested to more than 10 levels deep - this has to be a mistake."
+
 // Context
 #define STRING_CONTEXT_CREATE_RC     "A configuration file could not be found in {1}\n\nWould you like a sample {2} created, so taskwarrior can proceed?"
 #define STRING_CONTEXT_NEED_RC       "Cannot proceed without rc file."