changed install.php5 to respect line length limit according to SilverStripe coding conventions
formatted install.php5 according to SilverStripe coding conventions (tabs instead of spaces, no 1 line if with else, ...)
formatted install.php5 according to SilverStripe coding conventions (spaces)
Merge pull request #2550 from Zauberfisch/3.1

formatted install.php5 according to SilverStripe coding conventions