oxidize git-absorb

[Sebastian Thiel (Byron)]

Repo: https://github.com/tummychow/git-absorb

Features

• diff tree to tree
• diff tree to index
• diff blob to blob (of modified entries/files)
• patches from diffs (imara-diff can do that or shows how)
• lots of computation on hunks (imara-diff provides the info and it should be doable)
• build tree with modifications
  • convenient way to get entries from the builder
• topo commit traversal first parent only
• hide commit by not walking it (probably yes)
• list local branches
• Commit::summary() - kind of there, needs first paragraph.

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Original issue: #782