Hello cube lovers!

requested edge pair flip without disturbing centres (p2),
as well as a minor correction for the 5x5x5 process:

> ...
> (retain centre positions ) + U2 r1 (u2 r2 l2) ^2 + r3 U2 r2     (26)
                                                                  ^^^^
> 
> 5x5x5 processes (measured in slice moves)
> 
> Flip 2 middlemost edges at FD and BD with:
> p1 (fm1 D1) ^3 + fm1 D2 + (fm1 D1) ^3 + fm1   (disturbs some centres)
> followed by:
>    D1 + (fm2 u2) ^2 + (fm2 l2) ^2 + D3    (corrects the centres)  (25)
> -> Mark                                                           ^^^^
> Email: mark.longridge@canrem.com

The following might be trivial, but i write it here anyway. This was
invented about 10 years ago:

5x5x5
-----

(R1 um2 R2 um1 R1) + U2 + (R3 um3 R2 um2 R3) + U2  ----> 12 (18) turns :)

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