v2.1.0

Add a function (--tree_BFS) to collaspe the tree into multiple clusters based on the ancestal lineage annotation.
For large clusters (>exploreTreeNodeLimit), a BFS algorithm will stratify them into smaller bubbles.
Small clusters (<smallClusterLimit) and small bubbles (<smallBubbleLimit) will be merged into their perent clusters/bubbles.

v2.0.0

TIPars2: An ultrafast and memory-efficient ancestral lineage annotator for huge SARS-CoV-2 phylogeny using F1-score
Initial release inlucdes two major founctions: ancestral lineage annotattion and tree refinement.