v0.6.1

Added

• Added conf field "ldap_add_created_at" to opt in for creating LDAP users with creation date
  Note: the field value field "createdAtRole" under the array field "objectclass_common" is needed
  in the config file. Otherwise one gets an error while creating an LDAP user.
• Added configuration field "ldap_default_user". Allows to define username for LDAP login used by default.
• Added CLI option to specify the configuration file
• Logging also performed to logging file
• SSH key pair can be provided by field within configuration file or as a CLI argument.

Changed

• In CLI, connection to LDAP and Slurm is checked before any attempt at performing adding/removing/listing or modifying/listing.
• In CLI, user can just press enter to provide no password during password prompt for SSH (useful for ssh key pair without password).

Fixed

• Fixed broken Quota creation exit code check in dir.rs.
• Some typos