Fix a lot of bug in "source" field:

- missing creation table
- autoselect when creating order from proposal
- do not show proposal as origin when creating proposal
- use code instead of id
- use label in english
Also renamed table demand_reason into input_reason to match other table input_method.

htdocs/lib/functions.lib.php

@@ -3512,6 +3512,12 @@ function dol_htmloutput_errors($mesgstring='', $mesgarray='', $keepembedded=0)
  *	ascending (default) or descending output and uses optionally
  *	natural case insensitive sorting (which can be optionally case
  *	sensitive as well).
+ *  @param      array           Array to sort
+ *  @param      index
+ *  @param      order
+ *  @param      natsort
+ *  @param      cas_sensitive
+ *  @return     Sorted array
  */
 function dol_sort_array(&$array, $index, $order='asc', $natsort, $case_sensitive)
 {