Chart cat multi lvl for preview#2

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huandzh wants to merge 17 commits intomasterfrom

chart_cat_multiLvl

Commits on Oct 14, 2014

cht: add chart.data.ChartDataMoreDetails
huand
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Commits on Oct 17, 2014

cht: chart values in tuple is now one tuple
huand
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Fix #123
huand
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Fix #123 : Mode property CT_ChartSpace.sers oxml readonly and compatible
huandzh@gmail.com
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Commits on Oct 20, 2014

Merge branch 'proposed_issue123' into chart_cat_multiLvl
huand
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Commits on Oct 22, 2014

chart:CT_NumCache.tuple_pts return (idx, float) istead of (idx, text)
huand
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Commits on Oct 23, 2014

CT_NumCache.tuple_pts try return float and return text if failed
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Commits on Oct 27, 2014

Chart: support no categories and no series
huand
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Commits on Oct 30, 2014

Escape series name
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Merge escape_series_name
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Commits on Oct 31, 2014

Merge branch 'master' into escape_series_name
huand
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