Merged the page and column breaks rendering: columns breaks are now
easily visible. The column boundaries are shown as before using plain
lines.

Also fixed the breaks rendering for vertical layout

It causes duplicate symbols over in automation when linking testool,
as the same functions that IMPL_GEN_RES_STR expands to also are in the
sts library.

this fixes an STL assertion due to invalidated iterator.

fixes an STL assertion; this line was accidentally removed in merge commit
bc3bbd2b

As everyone knows ODF is good for your soul, so this must be the
right approach.