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merge API
=========
 
The merge API helps a program to reconcile two competing sets of
improvements to some files (e.g., unregistered changes from the work
tree versus changes involved in switching to a new branch), reporting
conflicts if found.  The library called through this API is
responsible for a few things.
 
 * determining which trees to merge (recursive ancestor consolidation);
 
 * lining up corresponding files in the trees to be merged (rename
   detection, subtree shifting), reporting edge cases like add/add
   and rename/rename conflicts to the user;
 
 * performing a three-way merge of corresponding files, taking
   path-specific merge drivers (specified in `.gitattributes`)
   into account.
 
Data structures
---------------
 
* `mmbuffer_t`, `mmfile_t`
 
These store data usable for use by the xdiff backend, for writing and
for reading, respectively.  See `xdiff/xdiff.h` for the definitions
and `diff.c` for examples.
 
* `struct ll_merge_options`
 
Check ll-merge.h for details.
 
Low-level (single file) merge
-----------------------------
 
Check ll-merge.h for details.