rulesumCollectKD and sumCollectSimplifyKD

implement FactorSeparableSumCustom[]

scalar[] and sum[] improvements

improved rulesumSimplifyKD

never automatically remove the scalar[] marker

Zeroonvac[]; scalar[]; division support; some other minor improvements

bug fix fo snegrealfunctions called with argument a

updated test

update transformPH

simple-op version of ketbratensorproduct

support for two phonon modes

increaser version number

fix Rule vs. RuleDelayed problems

merge

Merge pull request #11 from pkuqiuning/patch-1