fix #4526
`@__FILE__`: macro for the source path at load time [close #4530].
Pkg.init: always print "Initializing..." message.
Fixes for sparse complex matrices
fix #4528
fix #4538
fix #4529
Merge pull request #4532 from JuliaLang/sk/__file__

`@__FILE__`: macro for the source path at load time [close #4530].
Merge pull request #4536 from priesj/master

LUFACT fixes for sparse complex matrices
Test for #4523 and #4536