This patch only adds the capability to the Difference Engine lib, not to
the user interface, yet.

This patch does two things: It makes sure the native json_decode() will
honor the JSON_LOOSETYPE option of the class and it also adds way
to skip the use of the native function completely. The latter is
necessary for slightly non-standard JSON data.

p_purge_metadata now updates the metadata cache and the INFO array like the other metadata writing functions

make custom buttons possible with html_btn() without the need of global $lang (more consistent with tpl_pagelink())

de / typo fix

SafeFN encoding now always end the encoding block by appending a dot at the end of the file name. This is necessary since the file name may get an extension which is not encoded.

  - use directories since working with them is atomic
  - delete stale locks after 5 minutes

I used the Latin of the first century
B.C., so the word are written as Cicero wrote: for example there isn't
the 'v' letter unless in capital form and if the word ending in -uus
or -uum, I wrote -uos and -uom. This form of Latin, as I said, is that
of the classic authores as Cicero, Caesar, Sallustius etc...