GWT normal ordering, need permutation and sign rule
normal ordering for multi-configuration, need to verify correctness
a bug fixed for normal ordering for mSQS, the sigh rule need to be done
Kong's wick theorem and normal ordering works now
bug fixed for wick theorem, need to verify the result
bug fixed for contraction in wick
fixed a bug in sign rule, and add debug print out in contractmSQS
combine contractSQS for Kong's wick theorem into contractSQS
make mSQS class only exist when SeQuantVacuumChoices["MultiConfiguration"] = 2
changes in normalOrderForm, modified debug print for function contratSQS and normalOrderForm
add contractIndex function for MultiConfiguration, now contractions that create matrix with zero value will be eliminated

fixed a bug in debug printing
added fullContract support for wick in MultiConfiguration
added expandEta function, now it is ready for further testing
fixed a bug in select indices functions, remove unused duplicated functions
fixed a bugs in contractSQS when length of string is greater than 2 for MultiConfiguration
add commute function for commutator
modified normalOrderForm to fit other expression
added unit test to some of the key functions
added function to convert cumulant to density matrices. fixed a bug in creating delta matrice
fixed a bug in ketIndices and convertLambda
added unit test
Merge branch 'multiconfig'
solved conflicts in
Conflicts:
	SeQuant.m