[expr] "raise to power" operator, similar to [pow] function

Returns an integer value if both arguments are integers, and [double]-precision floating-point otherwise.

The left operand may be any integer from Tcl's unlimited integer range.

The right operand is limited to a max integer value of 268435455 (0xfffffff) (28 bits).
(Unless the left operand is -1, 0, or 1, so that the answer is trivial).

Expect to wait a long while for [[expr 2**0xfffffff]] to return.

[PN] - Yes inded ! I am interested in these "long while" things too. Should we have some sort of standard protocol for handling this via a dialog widget and maybe a tcl_switch which turns dialogues re long processing times on or off.

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