Improve piechart

- drop goffice based chart, only keep jquery one
- move legend outside of plotting area

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@22794 57a11ea4-9604-0410-9ed3-97b8803252fd
Improve scatterplot chart

- drop goffice based chart, only keep jquery one
- support all jqplot shapes for the markers

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@22795 57a11ea4-9604-0410-9ed3-97b8803252fd