[FIX,ENH] Rework some of tiki-install.php's security checks. Depending on...

Benoit Grégoirerequested to merge
benoitg/tiki:tiki_check_security into master
  • [FIX,ENH] Rework some of tiki-install.php's security checks. Depending on timing, the installer could become inoperable because favicon.ico was requested by the browsers, unsetting the session. This caused the installer to get stuck in an authentication loop. Clear the authentication if a wrong password is entered. Check the the local.php authenticated against is still the same one to guard against inadvertently modifying databases when switching environment

This removes some pretend security, and adds some check to avoid mistakes.

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