Implicit Numeric Parsing fails on whitespace

[wduquette]

In molt, this code returns an error:

$ exit " 1 "
expected integer but got " 1 "
$

In Standard Tcl the command is accepted; and a look at Tcl_GetInt in Tcl 7.6 shows that it explicitly looks for and skips leading and trailing whitespace.

Molt uses Value::as_int to try to retrieve an integer from the argument; Value::as_int (and Interp::get_int, at time of writing) does not.

[wduquette]

Fixed by commit [46c512f3350a3458c43b4ece23fd8920c14cc3f3].