Log Message:
Update tex-pgf{,-doc} to 2.10.

Changes:
        - renamed 'halfcircle' marker to 'halfcircle*' and added 'halfcircle'.
        - provided special case 'mark color=none' for the half-filled markers.
        - added more predefined dashed and dotted line patterns for
	  black/white plots
        - Imported spell checking results of Stefan Pinnow
        - Dealed with typo in 'sci generic' number formatting style: it now
	  accepts 'mantissa' *and* 'mantisse'
	- many more changes and bug fixes.

See share/texmf-dist/doc/generic/pgf/ChangeLog for the complete list.