Upgrade minimum requirements to PHP 5.3

[macik]

Was: «Get syntax error with Resources.php on PHP5.2.17»

Parse error: syntax error, unexpected T_PAAMAYIM_NEKUDOTAYIM, expecting T_VARIABLE in cot918\system\resources.php on line 75

[trustmaster]

PHP 5.2 has been unsupported by PHP team for 4 years: http://php.net/eol.php. No bugfixes, no security updates for 4 years means it is unsafe to continue using it. Looks like it's time to upgrade our requirements to 5.3.

[Dayver]

And do not forget to change in https://github.com/Cotonti/Cotonti/blob/master/modules/install/lang/install.en.lang.php#L43 and https://github.com/Cotonti/Cotonti/blob/master/modules/install/lang/install.ru.lang.php#L43 and https://github.com/Cotonti/Cotonti/blob/master/Install.txt#L7

[macik]

Also:
fix functions.php:
https://github.com/Cotonti/Cotonti/blob/master/system/functions.php#L15-Lundefined

check (and may be delete) resources.rc.php:
https://github.com/Cotonti/Cotonti/blob/master/system/resources.rc.php#L124-L130

install.install.php:
https://github.com/Cotonti/Cotonti/blob/master/modules/install/inc/install.install.php#L114-L117
https://github.com/Cotonti/Cotonti/blob/master/modules/install/inc/install.install.php#L516-L520

[Alex300]

And update documentation: http://www.cotonti.com/docs/start/installation

[Alex300]

check (and may be delete) resources.rc.php:
https://github.com/Cotonti/Cotonti/blob/master/system/resources.rc.php#L124-L130

Пока оставлено т.к. используется функцией cot_timezone_search();, которая и сама то используется для апгрейда с Genoa. Может уже и она то и не нужна.