updated date and added IM sending

Updated the key version date which is output; also added the ability
to send IMs, allowing a script like Main.lsl to keep on going even
after requesting an IM.
many changes: reduced src size, fixed off by 2, &c

The time was continually off by two; this has been fixed.
The source grew too big; many comments or commented out code
were removed to allow the FS/SL editor to edit and compile.
RLVck (RLV check) was worked on and a "spinlock" added to avoid
a race - probably needs more work.