minor: commands.clear() is not needed in plugin_init() anymore. (done by pluginManager now)

removed some useless comments

plugins/changeitem.cpp

@@ -61,7 +61,6 @@ const string changeitem_help =
 
 DFhackCExport command_result plugin_init ( color_ostream &out, vector <PluginCommand> &commands)
 {
-    //commands.clear();
     commands.push_back(PluginCommand(
         "changeitem", "Change item attributes (material, quality).",
         df_changeitem, false,

plugins/changelayer.cpp

@@ -84,11 +84,8 @@ command_result changelayer (color_ostream &out, std::vector <std::string> & para
 
 DFHACK_PLUGIN("changelayer");
 
-// Mandatory init function. If you have some global state, create it here.
 DFhackCExport command_result plugin_init ( color_ostream &out, std::vector <PluginCommand> &commands)
 {
-    // Fill the command list with your commands.
-    commands.clear();
     commands.push_back(PluginCommand(
         "changelayer", "Change a whole geology layer.",
         changelayer, false, /* true means that the command can't be used from non-interactive user interface */
@@ -98,12 +95,8 @@ DFhackCExport command_result plugin_init ( color_ostream &out, std::vector <Plug
     return CR_OK;
 }
 
-// This is called right before the plugin library is removed from memory.
 DFhackCExport command_result plugin_shutdown ( color_ostream &out )
 {
-    // You *MUST* kill all threads you created before this returns.
-    // If everything fails, just return CR_FAILURE. Your plugin will be
-    // in a zombie state, but things won't crash.
     return CR_OK;
 }
 

plugins/cursecheck.cpp

@@ -57,7 +57,6 @@ DFHACK_PLUGIN("cursecheck");
 
 DFhackCExport command_result plugin_init ( color_ostream &out, std::vector <PluginCommand> &commands)
 {
-    commands.clear();
     commands.push_back(PluginCommand("cursecheck",
         "Checks for cursed creatures (vampires, necromancers, zombies, ...).",
         cursecheck, false ));

plugins/liquids.cpp

@@ -57,7 +57,6 @@ DFHACK_PLUGIN("liquids");
 DFhackCExport command_result plugin_init ( color_ostream &out, std::vector <PluginCommand> &commands)
 {
     liquids_hist.load("liquids.history");
-    commands.clear();
     commands.push_back(PluginCommand(
         "liquids", "Place magma, water or obsidian.",
         df_liquids, true)); // interactive, needs console for prompt