[bug #55077] automatic broadcasting for dot product

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Follow-up Comment #3, bug #55077 (group octave):

Matlab says this about binary operators:

Most binary (two-input) operators and functions in MATLAB® support numeric
arrays that have compatible sizes. 

The list of functions that Matlab has chosen to implement broadcasting is

Function	Symbol	Description
plus	+ Plus
minus	- Minus
times	.* Array multiply
rdivide	./ Right array divide
ldivide	.\ Left array divide
power	.^ Array power
eq	== Equal
ne	~= Not equal
gt	> Greater than
ge	>= Greater than or equal to
lt	< Less than
le	<= Less than or equal to
and	& Element-wise logical AND
or	| Element-wise logical OR
xor	N/A Logical exclusive OR
bitand	N/A Bit-wise AND
bitor	N/A Bit-wise OR
bitxor	N/A Bit-wise XOR
max	N/A Binary maximum
min	N/A Binary minimum
mod	N/A Modulus after division
rem	N/A Remainder after division
atan2	N/A Four-quadrant inverse tangent; result in radians
atan2d	N/A Four-quadrant inverse tangent; result in degrees
hypot	N/A Square root of sum of squares


Note that some of these are functions of 2-arguments, not just operators.  So,
*rem* does broadcasting.

The function *dot* seems similar to me.  For example, one might have a matrix
where each column is really a vector and one would like to take the dot
product of all of the vectors with a different one.

I don't have a strong feeling though about adding or not adding broadcasting
for the *dot* function.



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