Allow default search by identifier

Allow the identifier to be used on default search on Sales, Purchase,
Receivables, Payable, Maintence and also on sales search in POS.

Change-Id: I6f0c979e0155b4990f23cd47183a923a91d46cf2
fixes: http://bugs.async.com.br/show_bug.cgi?id=5505
Merge "Allow default search by identifier"