SubString write updates (fixes #6949)
Merge pull request #6958 from JuliaLang/kms/substring_write_fixes

SubString write updates (fixes #6949)
improve scale! using a cutoff threshold for calling BLAS
BLAS cutoff for vecnorm* functions
Update parallel-computing.rst

minor edits in first example in parallel-computing.rst to switch from deprecated usage of '+' to '.+' for scalar-array addition.
Merge pull request #6961 from levskaya/master

small fix in parallel-computing.rst
Avoid using BLAS.gemv! until #6941 is fixed.
Merge branch 'master' of github.com:JuliaLang/julia
Merge pull request #6959 from lindahua/dh/blas1

Set cutoff threshold for functions that rely on BLAS Level 1 routines (Close #6951)
Allow numbers to be `broadcast!`.
make printf rely less on global variables
fix printf %e of large BigInt values
fix printf %d BigFloat
minor cleanup of printf
add printf %f and %e for BigFloat. also fix a typeinference issue with sprintf, so it is faster than before
remove some typeasserts that were causing severe performance issues
remove another typeassert that caused performance degredation in printfd benchmark
Merge pull request #6919 from simonbyrne/inplace

Allow numbers to be `broadcast!`.
minor change that makes linalg1 pass under MKL
Merge pull request #6968 from lindahua/dh/linalg1c1

minor change that makes linalg1 pass under MKL