More testing coverage
Fixing 403 errors and problems caused by HTTPS redirects.
Added date handling for Excel numeric date handling
tsg_process_data() now arranges the core variables on the left hand side of
the data frame.
Fixed warnings caused by non-matching column names in tsg_core_data().
New internal data processing and file-reading functions
Replaced some dplyr functions with faster and more stable base-R functions.
Eliminated redundant calls to grant files URLS
First proper release, includes functions meeting basic requirements for use
A short vignette is available