ParserKeyword: fix typos and improve exception messages
grid property modifier keywords: make the box specifiers optional for all of them

this means adding defaults to EQUALS and COPY. While at it use -1 as
the default value for boxes in all of these keywords...
EclipseState: make it instantiable without a grid

instead of throwing, we now add a warning to the parser log...
EclipseState: make specifying anything which requires a grid an error if no grid could be instantiated
Split EclipseGrid in dimensions and cell info.

In many cases the only required information in an EclipseGrid instance
is the cartesian dimensions. To facilitate simpler testing - and not
have to create a full dummy grid the dimensions have been internalized
as a separate nx,ny,nz triplet. With this commit it is possible to
instantiate a grid with only dimensions, and no underlying ecl_grid_type
pointer.
Using shared_ptr<EclipseGrid> instead of bare EclipseGrid *
EclipseGrid - check content of c_ptr before use

This commit contains quite large changes to the EclipseGrid. The main
functional change is that the access to the ecl_grid_type pointer is
protected. In addition there are 'white space' changes due to methods
moving around and some methods have been marked static.
Check that exception is raised if PORV is initialized without grid.
Removed unused dummy grids in test deck.
Removed unnecessary default values.
Removed EclipseState::hasGrid() method
Changes to emacs file .
Added test of EQUALS keyword auto creation.
Merge pull request #353 from joakim-hove/EclipsestateNoGrid

Eclipsestate no grid