Don't clean *.bcf files as they are useful when generating stand-alone bibliographies using biber

chertex.sh

@@ -35,7 +35,7 @@ Rfiletype="R"
 TeXfiletype="tex"
 tikzfiles="*.tikz"
 Rnwfiles="*.Rnw"
-auxfiles="*.acn *.acr *.alg *.aux *.bbl *.bcf *.blg *.dep *.dpth *.fdb* *.figlist *.fls *.glg
+auxfiles="*.acn *.acr *.alg *.aux *.bbl *.blg *.dep *.dpth *.fdb* *.figlist *.fls *.glg
 *.glo *.gls *.lob *.lof *.log *.lor *.los *.lot *.out *.lox *.makefile *.map *.out *.run* *.slg *.slo
 *.sls *-tikzDictionary *.tdo *.toc *.xdy"