[LyX/master] Use Require instead of AddToPreamble

[Georg Baum]

commit 141026b6b1ceae5b8bee0133f81a3a6e23edbc68
Author: Georg Baum <b...@lyx.org>
Date:   Sun Sep 20 19:33:43 2015 +0200

    Use Require instead of AddToPreamble
    
    This plays more nicely with other modules requiring enumitem as well.

diff --git a/lib/layouts/enumitem.module b/lib/layouts/enumitem.module
index 966847a..6d3d7c4 100644
--- a/lib/layouts/enumitem.module
+++ b/lib/layouts/enumitem.module
@@ -41,7 +41,6 @@ Format 54
 #       Preamble-Styling specific to this list type.
 
 AddToPreamble
-       \usepackage{enumitem}           % customizable list environments
        \newlength{\lyxlabelwidth}      % auxiliary length 
 EndPreamble
 
@@ -57,6 +56,7 @@ IfStyle Itemize
                LabelString   "Itemize Options"
                Tooltip       "Optional arguments for this list (see enumitem 
manual)"
        EndArgument
+       Requires enumitem
 End
 
 IfStyle Enumerate
@@ -64,6 +64,7 @@ IfStyle Enumerate
                LabelString   "Enumerate Options"
                Tooltip       "Optional arguments for this list (see enumitem 
manual)"
        EndArgument
+       Requires enumitem
 End
 
 IfStyle Description
@@ -71,6 +72,7 @@ IfStyle Description
                LabelString   "Description Options"
                Tooltip       "Optional arguments for this list (see enumitem 
manual)"
        EndArgument
+       Requires enumitem
 End
 
 
@@ -92,6 +94,7 @@ Style Labeling
                                leftmargin=\lyxlabelwidth,#1]}
                {\end{description}}
        EndPreamble
+       Requires enumitem
 End
 
 
@@ -112,6 +115,7 @@ Style Enumerate-Resume
        LabelFont
          Color blue
        EndFont
+       Requires enumitem
 End
 
 # References