Fix hang/incorrect result for ndigits with b < 0.
Remove debug junk
Add tests for ndigits (issue #8266).
Move negative base check inside ndigits0z and add a test for (unsigned, signed) case.
ndigits: don't take abs(n) if b < 0.
Throw error when bigint ndigits has a negative base.
Merge remote-tracking branch 'julia/master' into ndigits_hang
Replace 'manual' cld with cld function now that #8111 has been merged.
Match previous ndigits0z interface.
Packages incompatible with your Julia version

If a package doesn't have any tagged versions compatible with your julia
version, it complains that

```julia
FixedPoint's requirements can't be satisfied because of the following fixed packages: julia
```
It seems confusing to consider julia a fixed package, so I changed the
message to.
```
ERROR: FixedPoint can't be installed because it has no versions that
support 0.4.0-dev+473 of julia
```
Fix tab completion segfault in reverse search
Fix find() when called with function and non-StridedArray

The previous code expected testfun to be vectorized, which does not match
the behavior of other methods, nor the documentation. Especially visible
when passing a sparse matrix. Always return an Array rather than an object
similar to the input, because it makes no sense to return a sparse vector.
Remove the method matching any object so that an error is raised rather
than returning incorrect results on non-AbstractArray (e.g. Set).
Import axpy! to BLAS and extend some BLAS 1 and 2 methods to work for StridedArrays
Update links for SuiteSparse

Apparently Tim Davis moved from Florida to Texas A&M
Update SuiteSparse to 4.3.1

Had to rearrange shared library linking to avoid undefined symbols on Windows
doc: varargs keywords can be mixed with non-varargs ones

And fix a variable name: k -> args.
Makefile: sys.o should depend on all .jl files in base

Also, it shouldn't depend on the manpage.
Merge pull request #8336 from JuliaLang/tk/suitesparse-4.3.1

Update SuiteSparse to 4.3.1, update links
Make sure man page is installed
add docs for readall(filename::String)