Allocate memory using the Tcl library's memory allocation engine. Like `malloc`, but integrates with the [memory] command (if that's defined). Pairs up with [Tcl_Realloc] and [Tcl_Free].

(2016-07-15) don't bother checking for memory allocation failure with Tcl_Alloc and ckalloc.
If you look at the source of the function Tcl_Alloc in tcl/generic/tclCkalloc.c, you will see that Tcl_Panic is called in case of error. Tcl_Panic calls abort(), never to return.

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