ERT-723: Removed the LARGE_CELL_MALLOC flag

Previously the cells could be allocated either as list of pointers to
cells, or as one large chunk of memory. There was a quite significant
performance hit from creating and destroying the cells individually
, therefor only the 'one continuous chunk' is supported.
ERT-723: Added nnc_vector copy() and equal()
ERT-723: Added nnc_info copy() and equal()
ERT-723: Added ecl_coarse_cell_equal()
ERT-723: Added ecl_grid_alloc_copy()
ERT-723: Added verbose flag to all grid compare.
Merge pull request #566 from joakim-hove/ERT-723-reset-actnum

Ert 723 reset actnum
Updated ecl_sum_identify_var_type()

Summary keywords starting with LC, LS and LC are recognized as various
LGR related kewyords, however it is also legitimate with keywords
starting with LX for x not in {C,S,W} - these keywords are classified as
miscellaneous.