perf: add perffncacheencode Examples (all done with somewhat dated clones I found on my disk): Netbeans (~120k entries in fncache): $ hg perffncacheencode ! wall 4.338000 comb 4.336828 user 4.336828 sys 0.000000 (best of 3) Openoffice (~77k entries in fncache)): $ hg perffncacheencode ! wall 1.533000 comb 1.528810 user 1.528810 sys 0.000000 (best of 7) Xen (~10k entries in fncache): $ hg perffncacheencode ! wall 0.198000 comb 0.187201 user 0.187201 sys 0.000000 (best of 51) Done on Windows 7 x64.