moses: avoid multiple score evaluations
moses: minor precision scorer updates
moses: precision scorer: create generic scorer
es: precision: provide a more efficient scorer
moses: bugfix for total ensemble score.
moses: precision scorer diary updates
moses: bugfix precision scorer
moses: improved score ranking when boosting enabled.
moses: status update
Merge pull request #984 from linas/moses-select5

Moses -- boosted precision scorer updates
moses weightedUTest: tweak rand num generator
Merge pull request #985 from linas/moses-select5

moses weightedUTest: tweak rand num generator
moses: start an alternate attempt at boosting pecision
moses: rest of the non-exact precision implementation
moses: expose new boosting varients with options.
moses: status update
Merge pull request #986 from linas/moses-select6

Moses: alternate variant of precision boosting