Add documentation of what is an unset waypoint id
Add documentation of what is an unset waypoint id

ThibaultR/cgeo,matej116/cgeo,rsudev/c-geo-opensource,vishwakulkarni/cgeo,matej116/cgeo,marco-dev/c-geo-opensource,ThibaultR/cgeo,cgeo/cgeo,xiaoyanit/cgeo,vishwakulkarni/cgeo,SammysHP/cgeo,tobiasge/cgeo,schwabe/cgeo,pstorch/cgeo,Bananeweizen/cgeo,kumy/cgeo,tobiasge/cgeo,schwabe/cgeo,kumy/cgeo,cgeo/cgeo,xiaoyanit/cgeo,vishwakulkarni/cgeo,ThibaultR/cgeo,Bananeweizen/cgeo,KublaikhanGeek/cgeo,superspindel/cgeo,rsudev/c-geo-opensource,superspindel/cgeo,mucek4/cgeo,Huertix/cgeo,tobiasge/cgeo,auricgoldfinger/cgeo,S-Bartfast/cgeo,KublaikhanGeek/cgeo,cgeo/cgeo,pstorch/cgeo,Bananeweizen/cgeo,lewurm/cgeo,KublaikhanGeek/cgeo,brok85/cgeo,mucek4/cgeo,marco-dev/c-geo-opensource,samueltardieu/cgeo,S-Bartfast/cgeo,SammysHP/cgeo,madankb/cgeo,pstorch/cgeo,yummy222/cgeo,auricgoldfinger/cgeo,lewurm/cgeo,schwabe/cgeo,brok85/cgeo,mucek4/cgeo,brok85/cgeo,Huertix/cgeo,matej116/cgeo,samueltardieu/cgeo,marco-dev/c-geo-opensource,yummy222/cgeo,madankb/cgeo,lewurm/cgeo,superspindel/cgeo,yummy222/cgeo,auricgoldfinger/cgeo,kumy/cgeo,rsudev/c-geo-opensource,xiaoyanit/cgeo,cgeo/cgeo,Huertix/cgeo,madankb/cgeo,samueltardieu/cgeo,schwabe/cgeo,S-Bartfast/cgeo,SammysHP/cgeo