Vectorize colwidths

[eanokian]

updated gentlg() to accept argument wcol as a list of vectors, which allows to apply different column widths for each element in huxme (when huxme is a list of dataframes).

[gmbecker]

minor tweaks but looks good

[gmbecker]

few final tweaks and additional comments. After these consider it approved

[eanokian]

thanks @gmbecker for the feedback, they make sense and applied the suggested changes. There's just a comment I left regarding a check that is being performed in gentlg_single() as well, just waiting for your stand on whether I should remove it from gentlg().

[kpagacz]

I don't understand what a non-data.frame list is.

[eanokian]

it's related to @gmbecker 's comment, a single data.frame is also a list:

> is.list(mtcars)
[1] TRUE

a "non-data.frame list" is a list that also is not a single data.frame. E.g.
list(mtcars) is a non-data.frame list, but mtcars is not.