Avoid duplicate tags when updating files #232
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Since we cannot know in every case whether the tags file contains absolute or relative pathnames, let's remove old tags that use either version of the pathname.
Fixes #231 for Unix. Unfortunately my Windows scripting skills are insufficient to implement the full logic in plat/win32/update_tags.cmd, but at least I updated the argument parsing loop so it won't fail if it sees the new -a argument.