MapEd history: improve JumpTo procedure 
MapEd history: improve JumpTo procedure 

no need to unde 500 checkpoints, we could just find needed one and load it
thibmo/kam_remake,reyandme/kam_remake,reyandme/kam_remake,thibmo/kam_remake,reyandme/kam_remake,thibmo/kam_remake,thibmo/kam_remake,reyandme/kam_remake,thibmo/kam_remake,reyandme/kam_remake