add BamView options

etc/options

@@ -857,6 +857,12 @@ hyperlinks = \
   Rfam http://rfam.sanger.ac.uk/family/ \
   GI http://www.ncbi.nlm.nih.gov/entrez/sutils/girevhist.cgi?val=
 
+# BamView
+# No. threads used to read from multiple BAM files
+bam_read_thread = 2
+# Max read coverage to display
+bam_max_coverage = 10000
+
 #
 # CHADO DATABASE OPTIONS 
 #