Looks like we can't pre-sort GetPot::section_list
Looks like we can't pre-sort GetPot::section_list

See #481. No longer sorting GetPot::section_list and now using
a linear search in GetPot::have_variable().

Mbewu/libmesh,Mbewu/libmesh,Mbewu/libmesh,Mbewu/libmesh,Mbewu/libmesh,Mbewu/libmesh,Mbewu/libmesh,Mbewu/libmesh,Mbewu/libmesh