removed duplicate files that caused troubles under Mac OS X. For some reason, serveral files existed with uppercase and lowercase names, where the latter was a previous converntion in Xinha. cvs on Mac OS X reported "cvs update: move away ...; it is in the way" even on new checkouts
Updated to Xinha nighly (Dec 3, 2012) due to reported problems with IE9
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- abstract in check for existance of a command whether this is  scripted or not
- reduce stress on util-memoize cache to improve scalability
- use a more modern tcl command set
- prefer "string match" over "regexp"
- abstract in check for existance of a command whether this is scripted or not
- abstract in check for existance of a command whether this is scripted or not
- use a more modern tcl command set
- don't use regexp when not needed (match is so much faster).
- provide context info for naviserver writer threads
- reset "extra_url", needed for internal redirects on errors.
remove unneeded arg