Basic fusion

added 4 commits

• 62c48908 - Move assignment aggegration into its own function
• 7bcbd3b1 - Clarify what grudge.sym.Variable is for
• a0d9a8bf - Minor tweaks to wave-min
• 600ea1fb - Implement rewriting of assignments into loopy kernels

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added 1 commit

• aa913014 - Tweak loopy kernel stringification [ci skip]

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added 3 commits

• a4575906 - Py2 fix: use six for intern
• c744fbcc - Teach loopy execution about Ones, If, Comparison, mop up scalar .get() cases
• 8297285a - Merge branch 'basic-fusion' of ssh://gitlab.tiker.net/inducer/grudge into basic-fusion

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added 1 commit

• 4fea2f6f - Remove one more scalar get from tests

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enabled an automatic merge when the pipeline for 4fea2f6f succeeds

mentioned in commit c5e574c0

merged