Modify the name and attribute of three grep commands
Modify the name and attribute of three grep commands

Add the "grep" prefix to the "jump", "next" and "prev" commands for
homogeneity with other kak scripts, and prevent the "grep-jump" command
from raising errors by enclosing it into a try{} scope.

ekie/kakoune,jkonecny12/kakoune,zakgreant/kakoune,zakgreant/kakoune,jjthrash/kakoune,flavius/kakoune,alpha123/kakoune,jkonecny12/kakoune,casimir/kakoune,mawww/kakoune,occivink/kakoune,Somasis/kakoune,lenormf/kakoune,occivink/kakoune,danr/kakoune,lenormf/kakoune,danr/kakoune,Somasis/kakoune,danr/kakoune,mawww/kakoune,casimir/kakoune,jjthrash/kakoune,elegios/kakoune,mawww/kakoune,jjthrash/kakoune,zakgreant/kakoune,elegios/kakoune,jjthrash/kakoune,flavius/kakoune,Somasis/kakoune,elegios/kakoune,flavius/kakoune,alpha123/kakoune,ekie/kakoune,ekie/kakoune,occivink/kakoune,danr/kakoune,alpha123/kakoune,alexherbo2/kakoune,casimir/kakoune,Asenar/kakoune,alexherbo2/kakoune,Asenar/kakoune,lenormf/kakoune,casimir/kakoune,elegios/kakoune,mawww/kakoune,Asenar/kakoune,alexherbo2/kakoune,Asenar/kakoune,ekie/kakoune,flavius/kakoune,alexherbo2/kakoune,occivink/kakoune,Somasis/kakoune,alpha123/kakoune,jkonecny12/kakoune,zakgreant/kakoune,lenormf/kakoune,jkonecny12/kakoune