[Cin] Batchrender update diff

Generated by diff -u -w -B /home/guest/botva/src/cinelerra-git/cin-5/new-git/cinelerra/cinelerra-5.1/cinelerra/batchrender.C batchrender.C > /home/guest/botva/src/cinelerra-git/cin-5/batchrender_post_merge_raw_fix.diff (a lot of options because I wanted patch without empty lines added) and hand-editing header. probably should be applied from within cinelerra-5.1/cinelerra folder. should fix clonsole rendering and also fix -r file.xml overwriting in case it was not batchrender.xml AND should also NOT abort on GUI loading of same project file as batchrender job file .... (my previous patch introduced new crash because I used exit(1) even when GUI was running ..)