experimental revision of survey package

Documentation for package `surveyNG' version 0.1

close.sqlsurvey	Survey design based on SQL database
open.sqlmodelmatrix	Survey design based on SQL database
open.sqlsurvey	Survey design based on SQL database
sqlmodelmatrix	Create model matrix in a SQL table
sqlsubst	Substitute variables into a text string
sqlsurvey	Survey design based on SQL database
sqlvar	Horvitz-Thompson estimator for multistage sampling
svymean.sqlsurvey	Means and totals
svyquantile.sqlsurvey	Probability-weighted quantiles
svytotal.sqlsurvey	Means and totals