get rid of ani.options('outdir')

[yihui]

the option outdir is confusing, and users often do not know where the animations were created since it defaults to tempdir(); a better and common practice is to do everything in the current working directory

below is a list of affected functions:

$ grep outdir -r .

./inst/examples/ani.options-ex.R:## change outdir to the current working directory
./inst/examples/ani.options-ex.R:ani.options(outdir = getwd())
./inst/examples/saveHTML-ex.R:## use the function brownian.motion() in this package; note this page is created in 'index.html' under ani.options('outdir')
./inst/misc/Sweave_animation.Rnw:ani.options(outdir = getwd())
./inst/misc/Rweb/demo.html:ani.options(outdir = "/tmp")
./inst/misc/Rweb/Rweb.R:    imgdir = file.path(ani.options('outdir'), ani.options('imgdir'))
./NEWS:  ani.options('outdir') (similar to saveGIF())
./NEWS:    o fixed a buglet in saveMovie(): outdir does not actually work.
./NEWS:    o fixed a bug caused by the 'outdir' option in ani.options() when
./NEWS:  'outdir' is a relative path which makes ani.stop() fail (thanks,
./man/ani.options.Rd:  \item{outdir}{character: specify the output directory
./man/ani.options.Rd:  current working directory by \code{ani.options(outdir =
./man/ani.options.Rd:## change outdir to the current working directory
./man/ani.options.Rd:ani.options(outdir = getwd())
./man/saveHTML.Rd:## created in 'index.html' under ani.options('outdir')
./man/g.brownian.motion.Rd:g.brownian.motion(p = 20, start = 1900, digits = 14, file = file.path(ani.options("outdir"), 
./man/g.brownian.motion.Rd:unlink(file.path(ani.options("outdir"), ani.options("htmlfile")))
./man/saveLatex.Rd:  \code{ani.options('outdir')}? If you have not installed
./R/zzz.R:    outdir = tempdir(), imgdir = "images", htmlfile = "index.html",
./R/ani.start.R:    ani.options(outdir = c(ani.options("outdir"), setwd(ani.options("outdir"))))
./R/saveGIF.R:  outpath_final=file.path(ani.options('outdir'),movie.name)
./R/saveHTML.R:  imgdir = file.path(ani.options('outdir'), ani.options('imgdir'))
./R/saveHTML.R:  htmlfile = file.path(ani.options('outdir'), ani.options('htmlfile'))
./R/saveHTML.R:    message('You may use ani.options(outdir = getwd()) or saveHTML(..., outdir = getwd()) to generate files under the current working directory.')
./R/im.convert.R:    output.path = file.path(ani.options('outdir'), output)
./R/saveSWF.R:  outdir = ani.options('outdir')
./R/saveSWF.R:  owd = setwd(outdir)
./R/saveSWF.R:            output.path <- normalizePath(file.path(outdir, swf.name)))
./R/saveLatex.R:#'   \file{animfp.sty} to \code{ani.options('outdir')}? If you have not
./R/saveLatex.R:  outdir = ani.options('outdir')
./R/saveLatex.R:          ani.options(img.fmt = file.path(outdir, paste(img.name, '%d.',
./R/saveLatex.R:          ## outdir = '.'
./R/saveLatex.R:  owd = setwd(outdir)
./R/saveLatex.R:  img.fmt = file.path(outdir, sprintf("%s%s.%s", img.name, num, file.ext))
./R/saveLatex.R:                ifelse(full.path, gsub('\\\\', '/', normalizePath(file.path(outdir, img.name))), img.name),
./R/saveLatex.R:                ifelse(full.path, gsub('\\\\', '/', normalizePath(file.path(outdir, img.name))), img.name),
./R/ani.options.R:#' \item{outdir}{character: specify the output directory when we
./R/ani.options.R:#' working directory by \code{ani.options(outdir = getwd())}.}
./R/saveVideo.R:  outdir = ani.options('outdir')
./R/saveVideo.R:  owd = setwd(outdir)
./R/saveVideo.R:            output.path <- normalizePath(file.path(outdir, video.name)))
./R/g.brownian.motion.R:#' unlink(file.path(ani.options('outdir'), ani.options('htmlfile')))
./R/g.brownian.motion.R:    digits = 14, file = file.path(ani.options('outdir'),
./R/ani.stop.R:    setwd(ani.options("outdir")[2])
./R/ani.stop.R:    ani.options(outdir = ani.options("outdir")[1])