[mkgmap-dev] Merge unicode branch

Hi I'd like to merge the unicode branch. There are a fair few differences, but I think that they do not affect anything that currently works. I've tested a map with code-page=1250 and the branch and trunk results are identical. Currently code-page=65001 in trunk does not work at all so even if there are remaining bugs in the unicode support it should be an improvement. I'll merge it in a few days if there are no reports of regressions with the single byte code pages. ..Steve