- message in `fit_all_dsm()` when spline_by or spatial_options$by have empty factor

* `fit_all_dsm()` gains a `spatial_options` parameter. It is a list which can contain `by`to adjust spatial spline according to varaiable and `complexity` to adjust k of spatial splines

- New arugment in `prepare_soap()`, `bnd_limit` which allows to build soap with ocean limit or data limit

* New `DSM_sp_files()` allows to iteratively create dsm repo by `sp_name` in the "DSM/script_by_sp" directory

* `complete_missing_cov()` now handles POINTS and POLYGON grid. If `lon` and `lat` are not in the grid they are built from geometry

# Conflicts:
#	DESCRIPTION