[LyX/master] Add missing math delim decorations

[Georg Baum]

commit 9130bdb5ecaa7cc9a7c50f0bd3ee75332a5ba145
Author: Georg Baum <b...@lyx.org>
Date:   Wed Feb 26 21:18:31 2014 +0100

    Add missing math delim decorations
    
    This avoids a message "Deco was not found. Programming error?" on stderr.
    The added decorations are defined by amsmath, and equivalent to \vert 
(single
    vertical bar) and \Vert (double vertical bar), respectively. They are used 
to
    distinguish the single and paired versions (for use with \left and \right).
    These symbols should cause amsmath to be loaded, but this would be too
    dangerous to implement now.

diff --git a/src/mathed/MathSupport.cpp b/src/mathed/MathSupport.cpp
index 6db7fcb..810ff7a 100644
--- a/src/mathed/MathSupport.cpp
+++ b/src/mathed/MathSupport.cpp
@@ -315,7 +315,11 @@ named_deco_struct deco_table[] = {
        {"/",              slash,      0 },
        {"slash",          slash,      0 },
        {"vert",           vert,       0 },
+       {"lvert",          vert,       0 },
+       {"rvert",          vert,       0 },
        {"Vert",           Vert,       0 },
+       {"lVert",          Vert,       0 },
+       {"rVert",          Vert,       0 },
        {"'",              slash,      1 },
        {"<",              angle,      0 },
        {">",              angle,      2 },