add eltype, last, and pop! for IntSet
a few other intset-related fixes and doc updates
add some IntSet tests
fix smallint -> BigInt conversions, especially BigInt(Int128)
fix #3032, bug in immutable constructor with too few args
factor: don't generate as many primes when doing trial division.
primes: implement and test prime stuff for BigInts [closes #3033]

It is not recommended to use this code to factor large integers. The
primality testing for BigInts calls GMP, so should be pretty good.
test/Makefile: allow mpfr to be tested in isolation.
factor: precompute and use a list of small primes as before.
pkg2 wip: refactor using fixed() instead of installed().

It stands to reason that we don't actually care about what is not
fixed when we're figuring out what should be installed.
Fix mpz_probab_prime_p call

The number of tests to use wasn't there. I'm using 25, as it is
the recommended amount, but now it is also available as an extra
argument.
Add tests to isprime(::BigInt)
Merge pull request #3038 from andrioni/master

Fix mpz_probab_prime_p call
add isqrt (integer sqrt), use it to improve factor() (#3035)
export primes
Merge branch 'master' of github.com:JuliaLang/julia
add powermod for BigInt
Stata performance tests (#3029)

Stata Julia
fib 5 0
mandel 14 0
quicksort 24 0
pi_sum 1054 15
pi_sum_vec 202 144
rand_mat_stat 53 40
rand_mat_mul 1664 252

TODO: It would be nice to combine both these files into one file.
fill!: convert value once, fix fill!(Array(Float64,1),-0.0)

Previously, this erroneously returned an array filled with +0.0.

The fill value is now converted a single time when it doesn't match
the type of the Array, and then filled in via specialized methods
which only apply when the element type of the array and the fill
value's type are the same.
Revert "fill!: convert value once, fix fill!(Array(Float64,1),-0.0)"

This reverts commit 6413ebe7391be09b8112bf13b6b639d23a1f6d41.

When doing a `make clean testall` this commit caused this error:

	io.jl
	error during bootstrap: type does not have a native size
Add update date to package list
Merge pull request #3045 from andrioni/listpkg

Add update date to package list
powermod: avoid overflows by using widemul [closes #3036]