fix cut-and-paste issues in definition of  NORMALIZE_LANGUAGE_TAGS in BasicParserSessings
Merged in simon_spero/sesame/normalize_language_tag_setting (pull request #277)

fix cut-and-paste issues in definition of  NORMALIZE_LANGUAGE_TAGS in BasicParserSessings
SES-2064 Removed IE6-specific style content from template.xsl.
SES-2064 Removed unused IE-specific CSS files from http-server
Merged in dvisser/sesame/SES-2064-no-more-IE6 (pull request #280)

SES-2064 First stage of removing legacy IE 6 code.