add trn_grid_set_row function

this function is used to shorten the fnc trn_grid_fill
this solves the issue #14
Merge pull request #24 from raoufhamouda/subfunction_in_trn_grid_fill

add trn_grid_set_row function
Fix issue 15, extract code into is_row_equal
remove check on struct and accept RGB as function name
Merge pull request #25 from tibaugasc/issue15

Fix issue 15, extract code into is_row_equal
KWstyle: check only line length

This solve issue #26.
add function trn_grid_fill_row
Make test_tetrinria_core.c pass kwstyle script #23, fixed: code extraction in test_grid_new_destroy see assert_row_value, complete refactoring of test_grid_set_cells_with_piece simplification using trn_grid_equal, otherwise basic refactoring
merge with other group
Merge pull request #28 from ldelaye/master

add function trn_grid_fill_row and modify kwstyle
Merge pull request #29 from mlaine288/issue23

Issue #23, fixed