Disable use of weak symbols on Cygwin64 in PPL.
Correct derivative of bessel_K
Fix error converting solutions to dict when solving for multiple variables.
Merge branch 'develop' into t/17031/public/17031

* develop: (1547 commits)
  Updated Sage version to 6.4.rc0
  random doctest is random
  latex fixed
  Disable building of libitm
  Various fixes for GCC installation, remove deprecated sage_fortran script
  Only build c, c++, and fortran
  Use the vanilla gcc tarball
  Use tolerance setting and matrix values from #17126.
  Check if dispatch/object.h is present
  Additional failing doctest because of numerical noise.
  trac #17047: Broken doctest
  finishing the patch
  typo fixed
  Last fix for OS X. There are no cblas.h headers at all on the system. Using gsl_cblas.h for compilation.
  review patch for extended Fox derivative
  Copy the jmol launcher to the right location
  Put the import at the beggining of the method.
  Cleaning up the code.
  Putting the deleted line back.
  Let doctest with numerical noise in matrix2.pyx pass on different archs.
  ...
17031: reviewer's patch: fix doctests
Merge branch 'u/jpflori/ticket/16152' of trac.sagemath.org:sage into u/tscrim/ticket/16152-ppl

Conflicts:
	build/pkgs/ppl/SPKG.txt
Merge branch 'develop' into t/17128/ticket/17128

* develop: (1547 commits)
  Updated Sage version to 6.4.rc0
  random doctest is random
  latex fixed
  Disable building of libitm
  Various fixes for GCC installation, remove deprecated sage_fortran script
  Only build c, c++, and fortran
  Use the vanilla gcc tarball
  Use tolerance setting and matrix values from #17126.
  Check if dispatch/object.h is present
  Additional failing doctest because of numerical noise.
  trac #17047: Broken doctest
  finishing the patch
  typo fixed
  Last fix for OS X. There are no cblas.h headers at all on the system. Using gsl_cblas.h for compilation.
  review patch for extended Fox derivative
  Copy the jmol launcher to the right location
  Put the import at the beggining of the method.
  Cleaning up the code.
  Putting the deleted line back.
  Let doctest with numerical noise in matrix2.pyx pass on different archs.
  ...

Conflicts:
	src/sage/symbolic/expression.pyx
17128: reviewer's patch: make doctest pass with any var
Update to pkgconf-0.9.7
Remove patch that is now in upstream
Add numerical tolerance settings
Fix numerical deviation reported on sage-release
Trac #16152: Disable PPL use of weak symbols on Cygwin64

It just does not work.

URL: http://trac.sagemath.org/16152
Reported by: jpflori
Ticket author(s): Jean-Pierre Flori
Reviewer(s): Travis Scrimshaw
Trac #17031: Correct derivative of bessel_K

https://github.com/sagemath/sage/pull/25

URL: http://trac.sagemath.org/17031
Reported by: github/nbruin
Ticket author(s): Nils Bruin
Reviewer(s): Dima Pasechnik, Ralf Stephan
Trac #17128: Problem with solution_dict=True and solving for multiple variables

This bug was reported at http://ask.sagemath.org/question/24446/problem-
with-solution_dicttrue/:
{{{
sage: var('x y')
(x, y)
sage: sol=solve(x + y, [x, y], solution_dict=True)
------------------------------------------------------------------------
---
AttributeError                            Traceback (most recent call
last)
<ipython-input-2-d24a5a0d9f55> in <module>()
----> 1 sol=solve(x + y, [x, y], solution_dict=True)

/Users/palmieri/Desktop/Sage_stuff/git/sage/local/lib/python2.7/site-
packages/sage/symbolic/relation.pyc in solve(f, *args, **kwds)
    732     from sage.symbolic.expression import is_Expression
    733     if is_Expression(f): # f is a single expression
--> 734         ans = f.solve(*args,**kwds)
    735         return ans
    736

/Users/palmieri/Desktop/Sage_stuff/git/sage/local/lib/python2.7/site-
packages/sage/symbolic/expression.so in
sage.symbolic.expression.Expression.solve
(build/cythonized/sage/symbolic/expression.cpp:47600)()

AttributeError: 'list' object has no attribute 'left'
}}}
I think this was introduced in #16531.

URL: http://trac.sagemath.org/17128
Reported by: jhpalmieri
Ticket author(s): Miguel Marco
Reviewer(s): Ralf Stephan
Trac #17277: pkgconf depends on bzip2

We should be using the gzipped-tarball, not bzipped. Bzip depends on
pkgconf.

Upstream tarball
http://rabbit.dereferenced.org/~nenolod/distfiles/pkgconf-0.9.7.tar.gz

URL: http://trac.sagemath.org/17277
Reported by: vbraun
Ticket author(s): Volker Braun
Reviewer(s): Travis Scrimshaw
Trac #17278: Numerical noise on i386 VM

More numerical noise, this time in the 32-bit virtual machine appliance.

URL: http://trac.sagemath.org/17278
Reported by: vbraun
Ticket author(s): Volker Braun
Reviewer(s): William Stein