Various cosmetical changes

[multigrid_gravity] removed shortcut for clarity

[multigrid_gravity] Print the solver type only for the coarsest level

[multigrid_gravity] removed trust_fft_solution parameter

[multigrid] corrected a message

[multigrid_gravity] comment

[pcg] doxy, comments

[qa.py] disabled check for SVN Id

[qa] cosmetics

[gravity] removed unused imports
Merge pull request #10 from gawrysz/master

various cosmetical changes
Pass optional argument dir to guardcell-exchanging routines to request exchange limited to one direction
[dataio] Properly print the mode of parallel write to stdout
Merge pull request #11 from gawrysz/FIX_dataio_stdout

[dataio] Properly print the mode of parallel write to stdout
Pass optional argument nocorners to guardcell-exchanging routines to omit update of corner data
Merge branch 'master' into directional_guardcell_update
cor_dim moved from cg_list_bnd::internal_boundaries to constants
prefer counting from lbound to ubound of cg%[io]_bnd
allocate cg%[io]_bnd(xdim:cor_dim) to make space for separate corner segments (unused yet)
[mass_defect] fixed minor memory leak
do not addume that any cg%[io]_bnd(:)%seg is allocated
always allocate cg%[io]_bnd(cor_dim)%seg for safety
separated corner segments from face segments in cg%[io]_bnd
Merge pull request #12 from gawrysz/FIX_magic_mass_memory_leak

[mass_defect] fixed minor memory leak
Merge branch 'master' into directional_guardcell_update
fixed non unique MPI tags in mpi_bnd_types
Merge branch 'FIX_AMR_nonunique_tag' into directional_guardcell_update

Conflicts:
	src/grid/cg_level.F90
Merge pull request #13 from gawrysz/FIX_AMR_nonunique_tag

fixed non unique MPI tags in mpi_bnd_types
qa.py cosmeticss