Remove browse-kill-ring-highlight-inserted-item.

Allow browse-kill-ring-highlight-inserted-item-style to take the value
nil to indicate no highlighting, and remove
browse-kill-ring-highlight-inserted-item.

ChangeLog:

	Remove `browse-kill-ring-highlight-inserted-item' and instead
	allow `browse-kill-ring-highlight-inserted-item-style' to take the
	value `nil' meaning no highlighting.

	The default for `browse-kill-ring-highlight-inserted-item-style'
	is now nil for no highlighting, this matches the old initial value
	for `browse-kill-ring-highlight-inserted-item' which was nil by
	default.

	Given that I've removed an existing configuration variable I've
	bumped the version number.
Remove browse-kill-ring-highlight-inserted-item-style.

Restore browse-kill-ring-highlight-inserted-item, and allow it to take
value `pulse' and `solid' as well as `nil' and `t'.  The value `t' means
default, which is currently `pulse', `nil' still means off.

ChangeLog:

	Remove `browse-kill-ring-highlight-inserted-item-style' and
	instead allow `browse-kill-ring-highlight-inserted-item' to take
	the value `pulse' or `solid' as well as `nil' and `t'.  It's type
	is changed to `choice' accordingly.  The value `t' now means use
	the default highlight style, which is currently `pulse', `nil'
	still means turn off highlighting of inserted items.
Merge remote-tracking branch 'origin/master' into hl-inserted-style
Update the README file for changes to -highlight-inserted-item.

The control mechanism for highlighting inserted items has been
simplified, the README file is now up to date with these changes.
Merge branch 'hl-inserted-style' of github.com:T-J-Teru/browse-kill-ring into T-J-Teru-hl-inserted-style
Merge branch 'T-J-Teru-hl-inserted-style'