remove obsolete files
extract solcx
more work on solcx
fix solcx tests
add solcx file for the manual
extract solcx benchmark

- add benchmark/solkz/
- delete all sol* files from aspect
- update tests
update manual
Fix a bug where we did not properly take into account current_constraints when setting up initial conditions. This was correct until yesterday because then we had put all relevant constraints into 'constraints', but now they may reside in 'current_constraints'.
Merge branch 'master' of https://github.com/geodynamics/aspect
Merge pull request #47 from tjhei/benchmark_moving_two

Benchmark moving two
Add new tests
Merge pull request #56 from ian-r-rose/more_nullspace_tests

Add new tests for nullspace removal