Issue raised here:

• Detect Maxima/Minima CLIc#96

Fix example available here
Consist in skipping operation if coordinate is outside of buffer or if we are on the central pixel

if( all(localPos >= 0) && any(localPos != centerPos) ) {
  const float value = (float) READ_IMAGE(src, sampler, POS_src_INSTANCE(localPos.x,localPos.y,localPos.z,0)).x;
  if (value > localMax) {
    localMax = value;
    localMaxPos = localPos;
  }
} 

Need to propagate the fix to

• detect_minima
• detect_maxima_slice_by_slice
• detect_minima_slice_by_slice

Need also to propagate the fix for CLIJ and pyclesperanto_prototype version.