Only increment $seq when it has been used
Only increment $seq when it has been used

With this change, $seq goes structly sequential in the generated tree
nodes. Before, things like comments that don't lead to changes in the tree
increased the counter, too.

ptoscano/augeas,hercules-team/augeas,hercules-team/augeas-do-not-use,pevalme/augeas,kunkku/augeas,manandbytes/augeas,jjlin/augeas,ptoscano/augeas,manandbytes/augeas,GeoffWilliams/augeas,lutter/augeas,kunkku/augeas,lutter/augeas,mlichvar/augeas,hercules-team/augeas,bkearney/augeas,camptocamp/augeas,lutter/augeas,kumy/augeas,kumy/augeas,jtopjian/augeas,hercules-team/augeas-do-not-use,pevalme/augeas,domcleal/augeas,jjlin/augeas,GeoffWilliams/augeas,bkearney/augeas,pevalme/augeas,mchf/augeas,hercules-team/augeas-do-not-use,dafugg/augeas,ptoscano/augeas,kumy/augeas,domcleal/augeas,jasperla/augeas,MikaelSmith/augeas,raphink/augeas,domcleal/augeas,jasperla/augeas,mlichvar/augeas,kunkku/augeas,dafugg/augeas,raphink/augeas,camptocamp/augeas,dafugg/augeas,mchf/augeas,MikaelSmith/augeas,camptocamp/augeas,camptocamp/augeas,jtopjian/augeas,bkearney/augeas,jjlin/augeas,kumy/augeas,bkearney/augeas,mlichvar/augeas