Cast MUMPS data int indices to dolfin::la_index. Caused failure of compilation with 64-bit indices in PETSc.
Add a bunch of changelog lines.
Add changelog lines from Johan.
Changelog updates from Anders.
Merge branch 'martinal/topic-update-changelog-for-15'

Conflicts:
	ChangeLog
Check that GCC version is at least 4.6.

4.6 is reported to work, and 4.4 is know to fail. Not sure about 4.5, but it's pretty old anyway.
Add function SLEPcEigenSolver::eps() to access pointer to unerlying SLEPc object.
Ignore SLEPcEigenSolver::eps() in SWIG interface
Print GCC version if version check throws error.
Add a few more %ld
Remove instructions for 'in-tree' builds (fixes issue #429).
Change custom target for building tests from 'test' to 'tests' (fixes issue #428).
Only check gcc version with more rececnt CMake that provides compiler version varialble.

Maybe not so useful becasue more recent CMake probably also means more recent gcc.
Merge branch 'garth/fix-issue-408-check-gcc-version'
Merge branch 'garth/fix-issue-407-access-eps-pointer'
Merge branch 'jan/fix-mumpslusolver-int'
Add new elastity demo (Python) using smoothed aggregation AMG.
Add pulley mesh to download list.
Add first rough (but working) version of c++ elasticity + AMG demo
Add C++ smoothed aggregation AMG demo.