further work on nfs required by vault
minor fixes
Implementing operator== for nfs_vault & nfs_client structs
Adding DataNameAndCost type to nfs_vault
optional content in DataNameAndContentAndReturnCode
Compilation fixes.
Minor fix.
Workaround for compiler error.
Merge branch 'issue' of github.com:maidsafe/MaidSafe-Network-Filesystem into issue
Merge branch 'next' into issue