finish revisions to Universal tree items section

Author: briantoby

MDhelp/README.md

@@ -14,7 +14,7 @@ additional links that need to be added:
      191 docs/mainmenu.md 
       95 docs/others.md 
       10 docs/datatree.md
-     165 docs/commontreeitems.md
+     207 docs/commontreeitems.md
 
 These files have had only minor editing. A few need to be broken up:
 

MDhelp/docs/applicationwindow.md

@@ -1,3 +1,4 @@
+<!--- Don't change the HTML version of this file; edit the .md version -->
 # GSAS-II GUI Organization
 
 The GSAS-II GUI uses three windows, which are described below. The main window has two parts. To the left is the "Data Tree" and to the right is the "Data Window". A second window, called the "Plots Window" is used for graphics such as plots of data or display of three-dimensional structures. The third window, the Console window, is used to show output from the program. 

MDhelp/docs/commontreeitems.md

@@ -1,3 +1,4 @@
+<!--- Don't change the HTML version of this file; edit the .md version -->
 # GSAS-II data tree overview
 
 GSAS-II creates projects that are saved in `.gpx` files. The GSAS-II data tree, which is shown on the left side of the main GSAS-II window shows a hierarchical index to the contents of a project. This index will usually have all of the entries listed below on the [Universal Data Tree Items](./commontreeitems.md) page, which are found in all types of GSAS-II projects and will also have at least one entry representing some sort of experimental data (or simulation) -- called a histogram -- and will likely have one or more phase entries. 

MDhelp/docs/datatree.md

@@ -1,3 +1,4 @@
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 # Help for GSAS-II
 
 This and the subsequent web pages provide documentation for the
@@ -17,11 +18,12 @@ An index on the topics covered in these help pages is given below.
 2. [GSAS-II GUI Organization](./applicationwindow.md)
     1. [Data Tree](./applicationwindow.md#Data_tree)  
     1. [Data Window](./applicationwindow.md#Data_frame)  
-    1. [Plots Window](./applicationwindow.md#Plots)  
+    1. [Graphics Window](./applicationwindow.md#Plots)  
     1. [Console Window](./applicationwindow.md#Console)  
 3. [Main menu contents](./mainmenu.md)
-4. Data Tree headings, graphics windows and menu commands
-    1. [Top-level](./datatree.md) Data Tree headings
+4. Data tree entries and their use
+    1. [Data tree overview](./datatree.md)
+    1. [Universal data tree](./commontreeitems.md) items
     2. [Phase](./phase.md) Data Tree headings
     3. [Image (IMG)](./image.md) Data Tree headings
     4. [Powder histogram (PWDR)](./histgramtree.md) Data Tree headings

MDhelp/docs/index.md

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+<!--- Don't change the HTML version of this file; edit the .md version -->
 <a name="main_menu"></a>
 # GSAS-II Main menu commands
 

MDhelp/docs/mainmenu.md

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+<!--- Don't change the HTML version of this file; edit the .md version -->
 # Miscellaneous information
 
 <a name="MacOS"></a>

MDhelp/docs/others.md

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+<!--- Don't change the HTML version of this file; edit the .md version -->
 # GSAS-II Tutorials
 <a name="Tutorial"></a>