[ADD] sql_db: show file/line where the cursor was closed
[ADD] sql_db: show file/line where the cursor was closed

This will be printed along the error message whenever an attempt to use
a closed cursor is made (only in debug_sql log level).
vnc-biz/openerp-server,ovnicraft/openerp-server,MarkusTeufelberger/openobject-server,gisce/openobject-server,splbio/openobject-server,vnc-biz/openerp-server,ovnicraft/openerp-server,MarkusTeufelberger/openobject-server,splbio/openobject-server,splbio/openobject-server,gisce/openobject-server,MarkusTeufelberger/openobject-server,gisce/openobject-server