Update s-trim.c
Update s-trim.c

alf --> append_line_feed

I read Earl's comment in StackOverflow: 'adding a variable named alf while renaming hf and tf to make things "easier to understand" strikes me as inconsistent'. Earl is right.
rebol/rebol,rgchris/ren-c,giuliolunati/ren-c,earl/r3,kealist/ren-c,kealist/ren-c,draegtun/ren-c,mbk/ren-c,mbk/ren-c,draegtun/ren-c,mbk/ren-c,rebolsource/r3,earl/r3,draegtun/ren-c,kealist/ren-c,giuliolunati/ren-c,hostilefork/rebol,kealist/ren-c,earl/r3,rgchris/ren-c,rebolsource/r3,rebol/rebol,giuliolunati/ren-c,rebol/rebol,kealist/ren-c,codebybrett/ren-c,rgchris/ren-c,rebol/rebol,codebybrett/ren-c,kealist/ren-c,codebybrett/ren-c,codebybrett/ren-c,hostilefork/rebol,hostilefork/rebol,earl/r3,rgchris/ren-c,draegtun/ren-c,giuliolunati/ren-c,draegtun/ren-c,giuliolunati/ren-c,rgchris/ren-c,codebybrett/ren-c,codebybrett/ren-c,rebolsource/r3,mbk/ren-c,hostilefork/rebol,draegtun/ren-c,hostilefork/rebol,hostilefork/rebol