support for several axis calls on same side#410

Merged

lindsayplatt merged 11 commits intoUSGS-R:masterfrom jordansread:master

Oct 27, 2016

+66-5

Commits on Jul 12, 2016

Axis
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Axis
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Merge branch 'master' of github.com:jread-usgs/gsplot
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Commits on Jul 13, 2016

merge conflict
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Commits on Sep 20, 2016

Merge branch 'master' of github.com:USGS-R/gsplot
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Commits on Oct 25, 2016

multiple axis calls
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tests for USGS-R#408
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knit w/ new axis rules
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append FALSE by default
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check for head
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Commits on Oct 27, 2016

update per peer review comment
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