Backup

[puethe]

• set up schema "audit_backup" as "chado admin setup -s audit_backup "
• create a function to move data from schema "audit" to "audit_backup" when setting up the schema
• execute this function as "chado execute audit_backup "
• schema-qualify table names in DDL statements
• print DDL statements to screen after execution
• split function "query_to_file" into querying and writing to a CSV file
• use "tempfile" library for all temporary files created in tests
• tests for all new/changed components