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Re-allocated exit status codes according to three references, which follow:
BSD sysexits.h:http://www.gsp.com/cgi-bin/man.cgi?section=3&topic=sysexits
GNU recomendations:http://www.gnu.org/software/libc/manual/html_node/Exit-Status.html
Bash scripting:http://tldp.org/LDP/abs/html/exitcodes.html
The GNU recommendations stem from and expand upon the standard C/C++ library (stdlibc)
definitions, while also suggesting some best-practice conventions which happen to prevent
exit status code collisions with bash, and probably other shells.
The re-allocated codes are now mapped to constant values, set in *application/config/constants.php*,
and used throughout the CodeIgniter core. They would additionally be used in *index.php*,
but the constants file hasn't been loaded at that point, so the integer values are used
instead, and a comment follows each such use with amplifying information on why that
particular value was selected.
Finally, the errors documentation has been updated accordingly.
Signed-off-by: Daniel Hunsaker <danhunsaker@gmail.com>
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Removed completely unnecessary whitespace.
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Yes I know PHP 5.4 just came out, and yes I know PHP 5.3 has lovely features, but there are plenty of corporate systems running on CodeIgniter and PHP 5.3 still is not widely supported enough. CodeIgniter is great for distributed applications, and this is the highest we can reasonably go without breaking support. PHP 5.3 will most likely happen in another year or so. Fingers crossed on that one anyway...
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added notice of license to all source files.
OSL to all except the few files we ship inside of the application folder, those are AFL.
Updated license in user guide.
incrementing next dev version to 3.0 due to licensing change
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broke the Typography class's string replacements, for instance
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