Fix memory leak in ME0SegmentMatcher

[mark-grimes]

Fixes a small memory leak in ME0SegmentMatcher that looks to be proportional to the number of tracks. At 140 pileup this is about half a Mb per event.
Plot of retained memory before an after below.

Leak pointed out by David Lange.

(EDIT - I've just realised I labelled the series incorrectly. "After" is of course the line with flat memory use)

[cmsbuild]

A new Pull Request was created by @mark-grimes (Mark Grimes) for CMSSW_6_2_X_SLHC.

Fix memory leak in ME0SegmentMatcher

It involves the following packages:

RecoMuon/MuonIdentification

@cmsbuild, @nclopezo, @StoyanStoynev, @slava77 can you please review it and eventually sign? Thanks.
@battibass, @abbiendi, @bellan, @trocino, @bachtis, @rociovilar this is something you requested to watch as well.
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@fratnikov, @mark-grimes you are the release manager for this.
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[mark-grimes]

merge