merge: clarify non-linear default updates in docstring table Non-linear updates won't happen by default, regardless of -c/-C.

merge: combine the two "can't happen" cases in docstring table

merge: move "incompatible options" case first in docstring table

merge: make "linear" an input in docstring table Instead of having two ouputs, it seem simpler to have an addition input. This will allow further simplification.

merge: drop redundant column in docstring table The "same" and "cross" columns now have the same values, so let's combine them into "non-linear".

merge: drop obsolete non-linear cases from docstring table Since 6b1fc09c699a (update: change default destination to tipmost descendant (issue4673) (BC), 2016-02-02), non-linear updates can no longer happen if the user doesn't specify a destination, so we can drop these case from the table in the docstring of merge.update().

revert: move code dealing with deletions closer together

ui: fix configlist on Python 3 Since we're working on bytestrings, we have to use [offset:offset+1] to get consistent behavior on Python 2 and 3. I've only tested the _parse_plain closure, not the _parse_quote one, but I have no real reason to expect the latter to be broken since the fixes were fairly mechanical.

config: pass some optional args as keywords This makes it a little more obvious that self.read is being passed as include, which took me a moment to figure out.

config: load included config files in binary mode I guess we've been getting lucky that this works in Python 2. This fixes loading included config files in Python 3 (it used to fail on the "somebody set up us the BOM" check.)