29-01-2006: version 1.3.13

* Fixed behavior of Y^X for certain special cases (namely, 0^(0,0); (0,0)^0;
(0,0)^(0,0); 0^(1,0); (0,0)^(1,0). Note that the first three of those now
return (1,0); this is not consistent with the real HP-42S, which returns
"Invalid Data", but it is consistent with the way Free42 already treated
0^0).

* SIN, COS, P->R, and COMPLEX, when used in DEG and GRAD modes, now return
exact results for multiples of 90 degrees (100 grads). Also, the TAN function
now returns exact results for multiples of 45 degrees (50 grads).

* Added range checks to the complex versions of SIN and COS.

* In PRGM mode, the A..F command in the BASE menu now says
"Restricted
Operation".

* Windows version: when exiting the emulator using the OFF command (shift-EXIT
or XEQ "OFF"), the positions of the main and print-out windows would not get
updated in the state file.