Fixed header inheritance routine in order to not override fields which exist in original header (Issue-47)
Fixed header inheritance routine in order to not override fields which exist in original header (Issue-47)

Broken since r846

unispeech/unimrcp,unispeech/unimrcp,AaronZhangL/unimrcp-1,unispeech/unimrcp,AaronZhangL/unimrcp-1,AaronZhangL/unimrcp-1