Interpolation at grid elements

Topics
	Interpolation schemes

Modules
module	mod_grid_interpolation_common
	Common interfaces, subroutines and functions that can be used in interpolation schemes.
module	mod_grid_interpolation_init
	Initialization of declared extrapolation chemes.
module	type_int_dscheme
	Grid nodes Derivative Interpolation Schemes type.
module	type_int_fast_scheme
	The fast Interpolation/Reconstruction scheme type definition. The efficiency is based on:
module	type_int_grid_preweights
	The precomputed weights type definition for fast interpolation schemes.
module	type_int_scheme
	Grid nodes Interpolation Schemes type The difference with the t_int_point_1D resides in that the scheme is defined in a narrowed band between index_start and index_end. The stencil is centered around the index 0, the step is relative to this node.
module	type_int_weno_fast_scheme
	The fast Interpolation/Reconstruction WENO scheme type definition. The efficiency is based on:
module	type_int_weno_grid_preweights
	The precomputed weights type definition for fast WENO schemes.
module	type_int_weno_scheme
	The Interpolation/Reconstruction WENO Scheme type definition This definition of the WENO Scheme is based on a Finite Volume principle, and is thus a reconstuction, where the mean value of the data is known for a cell, contrary to interpolation based on node values. The difference is subtle and only happens in the associated weights.
module	type_rec_fast_scheme
	The fast Reconstruction scheme type definition.
module	type_rec_scheme
	Grid nodes Reconstruction Schemes type The difference with the t_int_point_1D resides in that the scheme is defined in a narrowed band between index_start and index_end. The stencil is centered around the index 0, the step is relative to this node.

Detailed Description

This module furnishes quick way to interpolate a particular field at the position of a grid's elements (centers, faces, vertices). The functions here are bound to be more efficient than **point-wise* interpolation.