[Cuis] [Updates] Microsecond resolution Time and TimeAndDate

[Juan Vuletich]

Hi Folks,

I've just published some updates and a new image. Biggest changes are in 
Time and DateAndTime. After some cleanup (removed a PoolDictionary and 
simplified code), I was able to dig deeper. Now we use the new 64 bit 
clock primitives in Cog VMs if available. This gives microsecond 
resolution Time and DateAndTime. In case the new primitives are not 
available, a combination of the seconds clock and the rolling 
millisecond clock is used. I redid the logic to synchronize them, 
removing many class variables, and enabling a faster image startup. But 
more important, users don't need to worry about millisecond clock roll 
over anymore. It is handled by new logic I did, that is robust wrt the 
moment the rollover occurs, and doesn't even need to know the clock max 
value.

New code is much simpler, faster and robust. On Cog, it is yet even 
faster, and with better temporal resolution.

I also added back ImageMorph >> #form, needed by Ken's Solitaire games.

Enjoy!

Cheers,
Juan Vuletich