added loading and saving for ihac
updated gitignore
node id reuse fix
addeding eval support for alternative approaches
added main
expanding param grid for IHAC
Merge branch 'ihac_test' of github.com:ftzeng/argos_cluster into ihac_test
param grids can be passed in externally
merge fix
Merge branch 'ihac_test' into algo_compare
merge fixes
added algo comparison command
added debugging for IHAC and fixed multi-parented children
Merge branch 'algo_compare' into digbc_clustering

Conflicts:
	core/digbc/__init__.py
	core/digbc/dig.py
	core/digbc/digbc.py
created parameterized clustering method for DIG SHC