#183 htmerge memory usage

[Marc-André Dumas]

Hi!

When I try to merge two large database (3-4000 urls),
htmerge use very large amount of ram (hundreds of megs).

I tracked the problem to the last phase of the merging,
when the words references are merged. The line "words =
wordDB.WordRefs();" loads all the words in memory.

Thanks!