Kill the next/prev page from the top & move lang chooser

The next/prev page takes way to much space there and isn't very
important feature to have such promonently in-your-face, creating
imbalance at the top.

Moved the language chooser to just above the version info
Some more cleanup. Also moved the verinfo down to give the Change language section a bit more room.
Fixed verinfo overlap with content on some pages.
Added more spacing around examples on pages such as http://www.php.net/manual/en/language.basic-syntax.phpmode.php