[Unison-hackers] patch to allow partial force or prefer

[Alan Schmitt]

Hello,

Here is a patch that allows to state that some files should always be  
sent from one side to the other ("forcepartial") or that conflicts  
for some files should always resolved for a given root  
("preferpartial").

The syntax is like one of predicates: to always force files in ".b"  
to be propagated from b, one writes:
forcepartial = Name *.b -> b

As for the force and prefer options, one may choose "newer" or  
"older" as the root.

Caveats:
- It was much simpler to keep the old "force" and "prefer" options  
natively instead of trying to implement them using the partial  
versions. As specified in the help, forcepartial overrides force, and  
preferpartial overrides prefer, for the specified files.
- The test that the roots make sense is not made until  
synchronization start. To do it at start time one would need a way to  
extract all the associations from a Pred.t. I'll look at this next.

Alan

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