API cleanup

[piccolbo]

First select is a misnomer, the fact hat SQL calls it that way doesn't make it better. We could rename the current select with a name in the tradition of transform and mutate (both of which are way too general for what the functions do). It could be calculate, compute, transmogrify, columns, new.columns, not sure. A select devoted to just selection could be based on dplyr select, with -colname and colname:colname syntax that have different meanings in the current select

[piccolbo]

Thinking about it, I'd make this a bigger reorg of the package. Too many duplicates, confusion. Here is a plan

package cleanup

%!% keep for lack of a better name
%|% keep
bottom.k keep
count.cols keep
dcast keep
do switch to something in the apply family
gather keep
get.format keep
group keep
group.f switch to something like apply family
input keep
intersect keep
is.grouped keep
magic.wand keep
merge keep
mergeable keep
moving.window keep
mutate toss, duplicate
output keep
quantile.cols keep
rbind keep or suggest lack of order
sample keep
select refocus like dplyr::select and add a generic compute or calc
subset toss, duplicates where and select
summarize toss unless dplyr:::summarize gets more general
to.rmr keep
top.k keep
transform toss, misnomer, duplicate
ungroup keep or rename something suggesting arbitrary groups, like scramble or chunk
union keep
vectorized keep
where keep