Added function_usable() to common functions

It is now used to check whether dangerous functions like eval() and exec() are available.
It appears that the Suhosin extension (which is becoming popular) terminates script
execution instead of returning e.g. FALSE when it has a function blacklisted.
function_exists() checks are insufficient and our only option is to check the ini
settings here.

Filed an issue here: https://github.com/stefanesser/suhosin/issues/18
... hopefully we'll be able to deal with this in a more elegant way in the future.

(this commit supersedes PR #1809)

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