Implementation of AD0056 item 5, don't signal nnpfc_input_pic_output_flag[i] flags when nnpfc_num_input_pics_minus1==0 and infer nnpfc_input_pic_output_flag[0]=1 instead

- Add the control for that flag in the cfg file & update the manual doc
- Implement checking at encoder side to ensure that when sending an update the base filter is already present
- Implement detection at decoder whether the given base filter is a new or a repetition filter.
- Implement checking at decoder side to ensure that when receiving an update filter, the base filter has been received earlier / already present.

JVET-AC0344: Signal 2 new syntax elements, nnpfc_extended_patch_width_cd_delta_minus1 and nnpfc_extended_patch_height_cd_delta_minus1 when nnpfc_constant_patch_size_flag is false, and only signal nnpfc_patch_width_minus1 and nnpfc_patch_height_minus1 when nnpfc_constant_patch_size_flag is true