[PR Tracking] for Tau Algorithm, Jet Algorithm, and Alg Updates (circa Mid Sept 2015)

[mulhearn]

76X PR cms-sw#11253 is already merged (since 7_6_0_pre5)
75X PR cms-sw#11437 is merged.
74X PR cms-sw#11435 is merged.
So far only the minimum prerequisites commits from #43 needed to compile cms_sw#11253 were included in the 74X PR. I still worry that stuff is missing in 74X but will follow up in that dedicated issue.

[mulhearn]

@apana you are interested in this.

[mulhearn]

After cherry-picking into 74X, the following compile error... some prereq missing... investigating.
error: 'isoTauLut' was not declared in this scope
unsigned lutAddress = isoTauLut->lutAddress(tauEt,jetEt);

[mulhearn]

This one isn't in 74X...
bbcafca

This was part of the wholesale 75X alg updates that weren't backported to 74X, tracking this issue here #43

[mulhearn]

Included in #67

[mulhearn]

David agrees to include in 74X, so no longer urgent issue.

[mulhearn]

All done.