added docs on the new farm options in the config file

misc-scripts/xref_mapping/FAQ.txt

@@ -96,9 +96,16 @@ Answers
       user=user2
       password=pass2
       dir=./ensembl_dir
+
+      farm
+      queue=long
+      exonerate=/software/ensembl/bin/exonerate-1.4.0
       ####################################################
       Note that the Directorys specified must exist when the mapping is done.
 
+      The farm options are totally optional and can be left out but may be needed
+      if you have different queue names or have exonerate installed not in the 
+      default place
 
       Now we can do the mapping.
       Ideally this should be done in two steps so that after the first step you 

misc-scripts/xref_mapping/xrefs_overview.txt

@@ -154,6 +154,10 @@ dbname=homo_sapiens_core_42_36d
 user=admin
 password=xxxx
 dir=./ensembl
+
+farm
+queue=long
+exonerate=/software/ensembl/bin/exonerate-1.4.0
 ------------------------------------------------------------------------
 
 Note it is good practice to put a sub-directory for the Ensembl