[TYPO3-core] RFC #13645: Bug and Cleanup: t3lib_div::formatSize should use IEC prefixes and appropriate units

[Sigfried Arnold]

Here it comes, Version 3 of the Patch (done against latest trunk).

First: it follows the Suggestions: "IEC prefixes suck" and introduces 
three calculation methods:

traditional: base 1024 with SI like prefixes (default)
iec: base 1024 with IEC prefixes
si: base 1000 with SI prefixes

The default is hardcoded atm, but could be easily moved to config defaults.

So by adding this patch, nothing will change for existing TYPO3 
enviroments - 100% backwards compatible.

It's also around 30 % faster (tested with 10 Million runs with 
surpressed output by using ob_start/ob_end_clear), than the last patch i 
deliverd. It uses now a logarithmic function to dertermine the exponent, 
so the filesize does not affect the speed anymore.

This function is in my enviroment for around 1 week now (with different 
default values): no problems, works fine and perfect.

any comments on this one?

regards
Sigfried Arnold
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