new 2-key insert functions
add case for 2 keys
add test for clang matrix multiply
group by 2 keys gen for grappa
Merge branch 'bmyerz-myrial' into bmyerz-matrix-multiply

Conflicts:
	raco/language/grappalang.py
move pairhash
move common rule stuff to clangcommon
myrial rule flow for grappa
get stdhash to be happy
Merge branch 'master' into bmyerz-matrix-multiply
Merge branch 'bmyerz-myrial' into bmyerz-matrix-multiply
use pair_hash wrapper
Merge branch 'bmyerz-myrial' into bmyerz-matrix-multiply

Conflicts:
	raco/language/grappalang.py
Merge branch 'master' into bmyerz-matrix-multiply
include a test
more useful pdf dot for this stuff
implement groupby no keys, e.g. for COUNT(*)
never added thisgit add c_test_environment/grappalang_myrial_tests.py
typo in template
refactor store and extract input file argument