[TYPO3-core] RFC: allow .. in names -> check for ../ (#3364)

[Martin Kutschker]

Hi!

Branches: HEAD / TYPO3_4-0

Problem:
It seems that t3lib_div::validPathStr() is to eager in denying paths. While it's possible to add a file with two dots in it, deleting (probably among other things) fails.

Solution:
Check for ../ instead of ..

Masi 
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