[2.1] add port to db constructor by default

[slaveek]

Hi.
I had small issue with data base connection. On my server, port to data base need to be defined.
Simply add port number like: define('DB_HOST', 'my.server.com:3307');
in config.php doesn't work. I had to hard code DB port in Database class like so:

parent::__construct(DB_TYPE . ':host=' . DB_HOST . ';dbname=' . DB_NAME . ';charset=utf8';port=3307', DB_USER, DB_PASS, $options);

So, I have propose to include (maybe in some future version) something like
define('DB_PORT', '????');
or
define('DB_PORT', substr(strrchr(DB_HOST, ":"), 1));

[panique]

Okay, let's do this in Milestone 3.0 (end of 2014, early 2015), as this is not urgent and a more or less rare edge case. Thanks for the notice!

[sopitz]

I wouldnt hardcode the port due to #423. Rather add it to your config.php as well.

[panique]

Done in develop