downgrade FileUtils.delete() error log to warning
downgrade FileUtils.delete() error log to warning

cgeo/cgeo,Bananeweizen/cgeo,S-Bartfast/cgeo,kumy/cgeo,Bananeweizen/cgeo,auricgoldfinger/cgeo,kumy/cgeo,cgeo/cgeo,rsudev/c-geo-opensource,tobiasge/cgeo,kumy/cgeo,pstorch/cgeo,tobiasge/cgeo,superspindel/cgeo,rsudev/c-geo-opensource,cgeo/cgeo,S-Bartfast/cgeo,superspindel/cgeo,auricgoldfinger/cgeo,rsudev/c-geo-opensource,S-Bartfast/cgeo,Bananeweizen/cgeo,superspindel/cgeo,auricgoldfinger/cgeo,matej116/cgeo,pstorch/cgeo,matej116/cgeo,pstorch/cgeo,cgeo/cgeo,tobiasge/cgeo,matej116/cgeo