fixed issue 1761:Add <col> elements to the grid for easier column formatting, thanks Anthony

VERSION

@@ -1 +1 @@
-Version 2.7.4-stable+timestamp.2013.11.01.17.44.38
+Version 2.7.4-stable+timestamp.2013.11.01.18.00.16

gluon/sqlhtml.py

@@ -2411,7 +2411,9 @@ class SQLFORM(FORM):
             limitby = None
 
         if rows:
-            htmltable = TABLE(THEAD(head))
+            cols = [TAG.col(_id=str(c).replace('.','-'),data={'position':i}) 
+                    for i,c in enumerate(columns)]
+            htmltable = TABLE(TAG.colgroup(*cols),THEAD(head))
             tbody = TBODY()
             numrec = 0
             for row in rows:
@@ -2863,6 +2865,7 @@ class SQLTABLE(TABLE):
         selectid=None,
         renderstyle=False,
         cid=None,
+        colgroup=False,
         **attributes
         ):
 
@@ -2886,6 +2889,11 @@ class SQLTABLE(TABLE):
                 (t, f) = c.split('.')
                 field = sqlrows.db[t][f]
                 headers[c] = field.label
+        if colgroup:
+            cols = [TAG.col(_id=c.replace('.','-'),data={'position':i}) 
+                    for i,c in enumerate(columns)]
+            components.append(TAG.colgroup(*cols))
+            
         if headers is None:
             headers = {}
         else: