added new method to retrieve the AlleleFeature associated with the VariationFeature in the StrainSlice object, mainly for use in web

  Wrong method name in POD heading for
  fetch_all_by_Slice_and_external_dbname_link().

  Make POD lines slightly shorter for same method.

Added more detail about healthchecks.

simple script that creates the input file needed by CopyDBoverServer.pl - you can use the -limit option  - very usefull when copying all core dbs across servers, such as staging to mart for instance

load the tables into the Core database.