IMPORTANT: Further enhacement of ROMS compiling and linking

[arango]

• The build scripts (build_roms.bash and build_roms.sh) are coorected to put the coupled model in the right place after USE_DEBUG is defined.

• Several make configuration file to the makefile were enhanced to allow more flexibility with environmental variables. Many thanks to Mark Hadfield for the suggesting (see ​src:ticket:797).

• Added interface for processing scalar variables in module inp_decode.F for functions load_0d_i, load_0d_l, load_0d_dp, and load_0d_r8. Many thanks to John Warner for his request.

The test repository was also updated.