Make it harder to leak memory into internal_string_container; add const string& support for varname arguments
Make it harder to leak memory into internal_string_container; add
const string& support for varname arguments



git-svn-id: ffc1bc5b3feaf8644044862cc38c386ade156493@3657 434f946d-2f3d-0410-ba4c-cb9f52fb0dbf

certik/libmesh,certik/libmesh,certik/libmesh,certik/libmesh,certik/libmesh,certik/libmesh,certik/libmesh