Document thread-safety issues in C callbacks
Merge pull request #5657 from timholy/teh/doc_callbacks

Document thread-safety issues in C callbacks
windows: fix .julia path
fix #5798
Fix #5804 so eigs works on matrices with dimension less than 6
Merge pull request #5808 from malmaud/n5804

Fix #5804 so eigs works on matrices with dimension less than 6
Update package listing
Fix UTF8 detection in some circumstances

e.g. on a typical Ubuntu installation setlocale() could return
something like: "LC_CTYPE=en_US.UTF-8;LC_NUMERIC=en_US.UTF-8;..."
etc. Without the patch this is not recognized as UTF8.

This fixes an issue with left/right arrow keys in the REPL if
Unicode characters are present.
fix spurious test failure on a system that happened to have an executable named 'foo' in the PATH
probably fix #5818
@parallel documentation in stdlib
Merge pull request #5820 from amitmurthy/amitm/atpdoc

`@parallel` documentation in stdlib
$(DESTDIR)$(prefix)/$(private_libdir) is redundant, should be $(DESTDIR)$(private_libdir)

I spent so much time introducing these Makefile variables, and yet I still have no idea how to use them