
Get all source files of a package, in the right order
Source:R/prep_expressions.R
r_package_files.RdIt uses the Collate entry in the DESCRIPTION file,
if there is one. Otherwise the order is alphabetical.

R/prep_expressions.R
r_package_files.RdIt uses the Collate entry in the DESCRIPTION file,
if there is one. Otherwise the order is alphabetical.