added --no-headers flag to disable header display in tabular modes

tablizer.pod

@@ -12,6 +12,7 @@ tablizer - Manipulate tabular output of other programs
       -v, --invert-match       select non-matching rows
       -n, --no-numbering       Disable header numbering
       -N, --no-color           Disable pattern highlighting
+          --no-headers         Disable headers display
       -s, --separator string   Custom field separator
       -k, --sort-by int        Sort by column (default: 1)
 
@@ -90,6 +91,11 @@ the original order.
 
 The numbering can be suppressed by using the B<-n> option.
 
+By  default tablizer  shows  a  header containing  the  names of  each
+column.  This  can be disabled  using the B<--no-headers>  option.  Be
+aware that  this only affects  tabular output modes.  Shell, Extended,
+Yaml and CSV output modes always use the column names.
+
 By  default, if  a  B<pattern>  has been  speficied,  matches will  be
 highlighted. You can disable this behavior with the B<-N> option.