sysdb-0.5.0

Release 0.5.0 of SysDB.

Version 0.5.0, Release Date: 2014-10-06
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  This release focuses on simplifications and more flexibility in the frontend
  and the query language. Most of those changes are not backward-compatible
  but easy client implementations.

   * sysdb:
     - Include priority when printing log messages.
     - Fixed handling of empty queries.
   * store:
     - When serializing the entire store (LIST command), return an array of
       host objects (rather than wrapping it into another object).
     - Fixed JSON format of time-series data.
     - Fixed error checks of invalid compare expressions and reject them.
     - Fixed lookups by back-end name.
     - Added support for comparing attributes with different types by
       comparing their string values.
   * frontend:
     - Clarified details about asynchronous messages and authentication
       options and made client implementation more robust.
     - Introduced a new message type encoding the JSON serialized response of
       a query and its data type.
     - Include the priority in log messages.
     - Include object types in FETCH, LIST, and LOOKUP messages.
     - Added support for including services and metrics in LIST responses and
       skip hosts without the respective children.
   * query language:
     - Added support for services and metrics to LIST command.
     - Changed syntax for attribute lookup to 'attributes[<name>]'.
     - Changed syntax for accessing queryable fields to '.<field>'.
   * utils:
     - strbuf: Improved memory management.
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