Deleted transpose function in utils.R since the C function is absent from utils.c. Deleted it as well from internal.Rd
Deleted utils.c and moved function triangulate to triangulate.c
Renamed C function triangulate into c_triangulate and updated triangulate.R
Added new file init.c to declare C and Fortran functions as recommanded by outputs of tools::package_native_routine_registration_skeleton(".")
Updated NAMESPACE "useDynLib(ads, .registration=TRUE)" as recommanded for R >= 3.4
Updated MD5

In src/*.h cosmetic changes to declare the same way all functions. In fads.R there was a wrong call to ripley_tr_disq_ic instead of coor_tr_disq_ic. Deleted comments en plot.vads.R that were problematic according to devtools:check() function. Updated DESCRIPTION, NAMESPACE and MD5 files