[Cairo] renaming cairo_concat_matrix

[tor andersson]

Well, postscript uses 'concat' and PDF uses 'cm' which I presume is short
for 'concatenate matrix'. Given the close correspondence between postscript
operators and cairo function calls, I'd think twice before throwing out
that tradition. I suggest cairo_concatenate() or cairo_concatenate_matrix()
despite the rather longish fully spelled out 'concatenate'.

As for rmoveto & co... you're screwed because you insist on separating
words with '_' :)

cairo_relative_move_to() or cairo_rmove_to() look like the two sanest
alternatives. or you can steer away from the postscript name -- which
in these operators is a bit of a misnomer since you're not actually giving
the point you're moving to: cairo_move_by().

/tor

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