template: add shortest(node) template function
Adds a '{shortest(node)}' template function that results in the shortest hex node
that uniquely identifies the changeset at that time. The minimum length can be
specified as an optional second argument and defaults to 4.
This is useful for producing prettier log output, like so:
@ durham shortestnode
| 77cf template: add pad function for padding output
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o durham
| b183 template: add shortestnode keyword
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o pierre-yves @
| 6545 backout: add a message after backout that need manual commit
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| o durham manifestcache
|/ 93f0 manifest cache
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| o durham catperf
| | c765 cat: increase perf when catting single files
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| o durham
|/ 9c53 changectx: increase perf of walk function
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