Functions updated up to 'ds.exp' inclusive.
Functions updated up to 'ds.exp' inclusive again.

Merge branch 'agaye' of https://github.com/datashield/dsbaseclient into agaye

Conflicts:
	R/ds.asCharacter.R
	R/ds.asFactor.R
	R/ds.asNumeric.R
	R/ds.changeRefGroup.R
	R/ds.corTest.R
	R/ds.dataframe.R
	R/ds.densityGrid.R
	man/ds.asFactor.Rd
	man/ds.changeRefGroup.Rd
	man/ds.corTest.Rd