vim-patch: 7.4.330

Problem:    Using a regexp pattern to highlight a specific position can
be slow.
Solution:   Add matchaddpos() to highlight specific positions
efficiently.
(Alexey Radkov.)
vim-patch: 7.4.334

Problem:    Unitialized variables, causing some problems.
Solution:   Initialize the variables. (Dominique Pelle)

Conflicts:
	src/nvim/screen.c
vim-patch: 7.4.344

Problem:    Unessecary initializations and other things related to
            matchaddpos().
Solution:   Code cleanup. (Alexey Radkov)
vim-patch: 7.4.362

Problem:    When matchaddpos() uses a length smaller than the number of
bytes in the (last) character the highlight continues until the end of
            the line.
Solution:   Change condition from equal to larger-or-equal.