fixed decoding only utf-8 encoded messages
updated search to support various operators and ordering

- Supported operators: =, !=, >, <, LIKE, NOT LIKE (thanks to Mikael for
  inspiration). Closes #2371.
- Shortening of functions last_updated and new_correspondence
bumped to version 1.0.5
Adds support for Basic HTTP auth
add support for HTTP digest authentication and better exceptions
specification

- add support also for HTTP Digest authentication
- specification of different exceptions
- global dictionary with regexp patterns
change project website to GitLab