fix style-application error (sheet number was not variable)
add caption from attr() instead of hardcoded; fix drop of attr when converting object-type
basic set/get function to set caption attr
basic example with styling for section headers
add support for attr-based col.margins
fix col.margin parameter
add support for row.margin based on attr
add footnote (previously: comment) function based on attr
add rounding to 100 if all R/C margin values are 99/100/101