Some minor improvements and fixes.
- [Improved] Removed code from deprecated old commands.
- [Improved] Headers are now improved to respect default values when empty.
- [Improved] A lot of code refactored and improved.
- [Improved] Better check for myslq client.
- [Improved] Command for dynvars in configuration file.
- [Improved] Unix domain sockets support in reverse proxy sites.
- [Improved] Duply and external sources updated.
- [Fixed] Default site issue after sites imported.
- [Fixed] Server reset command not reloading some Nginx settings.