[interfacekit] New support child parsedate()

Hi,

since there doesn't seem to be a Support Kit team of its own, I think I 
remembered that this team is working on it as well :-)

Anyway, I've put some new functions under the Support Kit umbrella, 
though they're found in libroot.so: parsedate(), parsedate_etc(), and 
set/get_dateformats().

In R5 its header can be found in posix/ - but since it's just not a 
Posix function, I don't feel good to put it in there. That's why it can 
now be found in os/support/, I hope you're alright with it.
I think its documentation should also go into the Support Kit part of 
the BeBook - and I could even write it, once I know in which format I 
should do it (I am hesitating to copy Be's HTML style since I thought 
we were following some dark XML paths).

I didn't put more work on your shoulders, though, since I've already 
implemented most of it in src/kernel/libroot/os/parsedate.cpp.

Adios...
   Axel.

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