batch writing of subdomain/block and side-set data to file
batch writing of subdomain/block and side-set data to file

fixes #968

libMesh/libmesh,jwpeterson/libmesh,balborian/libmesh,libMesh/libmesh,capitalaslash/libmesh,roystgnr/libmesh,90jrong/libmesh,pbauman/libmesh,roystgnr/libmesh,90jrong/libmesh,svallaghe/libmesh,balborian/libmesh,svallaghe/libmesh,libMesh/libmesh,vikramvgarg/libmesh,capitalaslash/libmesh,90jrong/libmesh,BalticPinguin/libmesh,capitalaslash/libmesh,balborian/libmesh,giorgiobornia/libmesh,dschwen/libmesh,hrittich/libmesh,benkirk/libmesh,hrittich/libmesh,giorgiobornia/libmesh,libMesh/libmesh,vikramvgarg/libmesh,giorgiobornia/libmesh,pbauman/libmesh,roystgnr/libmesh,BalticPinguin/libmesh,vikramvgarg/libmesh,hrittich/libmesh,balborian/libmesh,balborian/libmesh,jwpeterson/libmesh,benkirk/libmesh,90jrong/libmesh,jwpeterson/libmesh,BalticPinguin/libmesh,svallaghe/libmesh,jwpeterson/libmesh,benkirk/libmesh,hrittich/libmesh,90jrong/libmesh,balborian/libmesh,roystgnr/libmesh,capitalaslash/libmesh,jwpeterson/libmesh,90jrong/libmesh,hrittich/libmesh,libMesh/libmesh,pbauman/libmesh,benkirk/libmesh,BalticPinguin/libmesh,svallaghe/libmesh,vikramvgarg/libmesh,capitalaslash/libmesh,BalticPinguin/libmesh,90jrong/libmesh,dschwen/libmesh,BalticPinguin/libmesh,benkirk/libmesh,BalticPinguin/libmesh,giorgiobornia/libmesh,vikramvgarg/libmesh,roystgnr/libmesh,pbauman/libmesh,hrittich/libmesh,benkirk/libmesh,vikramvgarg/libmesh,libMesh/libmesh,hrittich/libmesh,giorgiobornia/libmesh,dschwen/libmesh,roystgnr/libmesh,roystgnr/libmesh,giorgiobornia/libmesh,jwpeterson/libmesh,dschwen/libmesh,BalticPinguin/libmesh,dschwen/libmesh,pbauman/libmesh,balborian/libmesh,giorgiobornia/libmesh,giorgiobornia/libmesh,libMesh/libmesh,capitalaslash/libmesh,roystgnr/libmesh,pbauman/libmesh,svallaghe/libmesh,jwpeterson/libmesh,svallaghe/libmesh,svallaghe/libmesh,pbauman/libmesh,vikramvgarg/libmesh,dschwen/libmesh,pbauman/libmesh,capitalaslash/libmesh,libMesh/libmesh,vikramvgarg/libmesh,pbauman/libmesh,vikramvgarg/libmesh,hrittich/libmesh,benkirk/libmesh,90jrong/libmesh,capitalaslash/libmesh,svallaghe/libmesh,benkirk/libmesh,benkirk/libmesh,balborian/libmesh,svallaghe/libmesh,dschwen/libmesh,balborian/libmesh,hrittich/libmesh,balborian/libmesh,dschwen/libmesh,90jrong/libmesh,giorgiobornia/libmesh,jwpeterson/libmesh