tidy the codes
fix a bug of wrong INTEGRATOR setting
add observer pattern to SimpMFIntegrator
use factory to create MFIntegrators
make CounterIntegratorObserver single threaded
extract MFObserver and MFObservable
move all the matrix factory options from preprocessor keys to the integrator factory
add BigDecimalMFMatrix tools for research
add MatrixMerger choice
add EmptyMatrixMerger
trivial commit
extract LagragleMatrixMerger
add multi-thread but single-matrix example
add logger
add RawMixResult
sort dirichlet boundaries before indexing lagrangle dirichlet nodes
use constructor instead of valueOf()
make integrator cores observable
add features of recording integrate cores
add a use case of CoreRecorderObserver