update tcsh to 6.20
remove cvs2svn prop
reset props for svn keywords
This commit was generated by cvs2svn to compensate for changes in r5028, which included commits to RCS files with non-trunk default branches.
Import of tcsh-6.18.01
Import of tcsh-6.17.00
Import of tcsh-6.15.00
Imported from FreeBSD 6.1 beta sources
Imported from FreeBSD 6.0 sources
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