updated for version 7.4.071
Problem:    Passing limits around too often.
Solution:   Use limits from buffer.
Added tag v7-4-071 for changeset faf7e86203b5
updated for version 7.4.072
Problem:    Crash when using Insert mode completion.
Solution:   Avoid going past the end of pum_array. (idea by Fransisco Lopes)
Added tag v7-4-072 for changeset d563839a9be0
updated for version 7.4.073
Problem:    Setting undolevels for one buffer changes undo in another.
Solution:   Make 'undolevels' a global-local option. (Christian Brabandt)
Added tag v7-4-073 for changeset d0595545e98a
updated for version 7.4.074
Problem:    When undo'ing all changes and creating a new change the undo
	    structure is incorrect. (Christian Brabandt)
Solution:   When deleting the branch starting at the old header, delete the
	    whole branch, not just the first entry.
Added tag v7-4-074 for changeset 9818311eeca0