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
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)
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
Reintroduce nnz and nonzeros as discussed in #6769
Deprecate nfilled for SparseMatrixCSC.
Deprecate nonzeros for StridedArray and BitArray.
Deprecate nnz for StridedArray.
Update documentation for structural nonzeros.
Update NEWS