Three small typos

line 14 : to contain all points from the origin layer.  ----> 'origin' should be 'original'

line 30 : Since the selction is not  ----> 'selction' should be 'selection'

line 32 : only a geoalgorithm algorithms can be ----> double wording, 'algorithms' can be left out

There was also one double spacing somewhere, but I can't find it anymore :(  ( Fixed it though)
Werner,

I did have the same thoughts. However, since there is the word 'layer' behind 'origin' my guess is that the intention was to use 'original'. 'origin' could have been used but then you should porbably have to leave out 'layer'.
Therefore I prefer 'original' which is consistent with several other use of this phrase.