correction on page break when cell is too height

[simon-feamzy]

No description provided.

[ELIONET]

@natancabral Could you please accept this pull request ?

[fellmann]

@simon-feamzy

1. I found the correct calculation to be:
   if (options.useSafelyMarginBottom && rowBottomY + rowHeight + columnSpacing + safelyMarginBottom >= maxY && !lockAddPage) onFirePageAdded();
   You were missing columnSpacing.
2. You fixed the bug in line 661, same bug is in line 811

@natancabral This seems a critical bug to me. Is this library still maintained?

[fellmann]

Plus, if the calculation is fixed, I would propose to reduce the magic safelyMarginBottom. Either to 0, or a small fixed amount like

let safelyMarginBottom = 14 /* points = 0.5 cm */

Right now, it is half the top margin, which is a problem with a large top margin e.g. if there is a letterhead.

[fellmann]

P.S.: fixes #62