[dev-context] core-reg.tex possible patch needed

Something I ran into in Epen which Taco helped me to fix. In cont-tmf.zip dated 22 March 07: core-reg.tex line 160 \iffourarguments throws up an undefined keyword error. I replaced with \iffourthargument and this error went away, but that may not have been the intended meaning. My register seemed to work okay after this fix, but in any case I am unsure what the new third argument to \dostartregister, "type", is to be used for here, so I can't test it. Duncan