Build 3.5.0.25 of xlsgen includes a number of fixes related to charts.

Namely,
- improved error bar compatibility function (was too constrained)
- automatic source code generator : capital P replaced by p in datalabelPlacement enumeration (otherwise would cause an improper automatic source code statement)
- automatic source code generator : SmoothedLine property generated for correct object interface (would cause an improper automatic source code statement)
- better parsing of formulas beginning with a '(' parenthesis, often used in chart data ranges to refer to union of cell ranges
- better read secondary charts of type scatter/bubble from XLSX files
- automatic source code generator : defaulting to classic chart theme, for consistency reasons
- better reading of combined X/Y/Xsec/Ysec axis formatting from XLSX files