Merge pull request #55 from joakim-hove/release/2013.03

Added (not yet used ...) integer flag to ecl_file_open()
added: ping build dependency for debian packaging
fixed: added zlib and iputils (ping) to redhat packaging build dependencies
Merge pull request #56 from akva2/fix_packaging

Fix packaging
fixed: small updates to debian packaging

- rename source to conform with standards
- add missing zlib dependency
Merge pull request #57 from akva2/update_debian_packaging

fixed: small updates to debian packaging