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Liberation fonts

Sebastien Binet requested to merge sbinet-gonum:liberation-fonts into master

First stab at embedding Liberation fonts.

The embedded asset is generated by running go generate ./vg/fonts vg/fonts/mk-fonts.go downloads a version of the liberation fonts from Fedora, untars it somewhere and runs go-bindata -o liberation_fonts_generated.go

The increase in size for a given binary (the histogram test) is as follows:

run-hist-old  8458416
run-hist-new 10809200

perhaps we could recoup some space by having people import _ "gonum.org/plot/vg/fonts" using the same kind of mechanism than database/sql's Driver ? In that case, perhaps it would be better to have the Liberation fonts live under "gonum.org/plot/vg/fonts/liberation" and put the fonts registration mechanism under "vg/fonts" But this would require client's code modification... (a relatively simple one, but still...)

Also, there is a fair amount of test-files updates... could someone make sure I haven't made any mistake? (the Liberation fonts are somewhat different in height.)

Fixes #107 (closed)

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