added wim.aggregate.fixed.R for wim raw data processing

From the bdp repository, with commented out stuff deleted.
add new file to component.json
added wim loading, get_couch.  tweaked get.medianed amelia

get.medianed.amelia refactored to allow getting unzoo'ed
imputed vds files without having to go through the plotting code,
and with knowing the filename directly, thus saving a query to the
server.

modified component.json for the new R files

added get_couch.R, but not really using it yet, I don't think

added wim.loading.functions.R for the use in vdswim imputing