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r2136 | helixhorned | 2011-11-26 14:39:50 -0800 (Sat, 26 Nov 2011) | 15 lines

In backing up highlighted sectors code: also back up TROR information so
that bunches and nextwall links are restores, too.  Now, to coalesce two
TROR maps (e.g. for a CBP), one could
  do for i allsectors, sethighlightsector i 1
on the console, and then load the 'other' map to copy over the contents
of the first, including all TROR stuff. Note that neither selecting
all sectors with RAlt, nor duplicating them with Insert would lead to
the desired effect (yet).

Internally,
 - yax_setbunch() now has different behavior for bunchnums -1, -2 and -3
   (it either clears the nextwalls or not)
 - build.c has a helper function free_n_ptrs(). This could be handy in
   other situations where many blocks of memory must be allocated
   consecutively and freed in case of failure
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r2135 | helixhorned | 2011-11-26 06:12:59 -0800 (Sat, 26 Nov 2011) | 3 lines

When restoring temporarily backed up map, clear all TROR bunches. This is
suboptimal, but at least 'correct' and won't produce the aforementioned
corruptions anymore.
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