make mul! fast if first arg is Adjoint, fix block size (#172)

[dlfivefifty]

Fixes #172

[codecov]

Codecov Report

Merging #173 (615e15b) into master (de2a314) will increase coverage by 0.11%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #173      +/-   ##
==========================================
+ Coverage   91.13%   91.25%   +0.11%     
==========================================
  Files          15       14       -1     
  Lines        1230     1304      +74     
==========================================
+ Hits         1121     1190      +69     
- Misses        109      114       +5     

Impacted Files	Coverage Δ
src/abstractblockarray.jl	94.36% <ø> (ø)
src/blockarray.jl	95.62% <ø> (ø)
src/blockbroadcast.jl	93.91% <ø> (ø)
src/blockdeque.jl	92.47% <ø> (ø)
src/blockindices.jl	77.98% <ø> (ø)
src/blocks.jl	95.65% <ø> (ø)
src/pseudo_blockarray.jl	84.33% <ø> (-1.10%)	⬇️
src/blockaxis.jl	96.58% <100.00%> (ø)
src/blocklinalg.jl	95.48% <100.00%> (+2.82%)	⬆️
src/show.jl	97.50% <100.00%> (+1.91%)	⬆️
... and 3 more

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[dlfivefifty]

@antoine-levitt I'm planning to drop Julia v1.5 (the change in print is annoying to maintain support). Any problems with this?

[antoine-levitt]

Not for us (we already depend on 1.6)