Changed coordinate computation for the analytical solution s.t. now also working when box has negative origin.

Corrected coordinate computation in drawing a sphere/disk. Now centering also working when box has negative origin.

# Conflicts:
#	src/CMakeLists.txt
#	src/FiniteDifference/eq_unit_test.cpp
#	src/Operators/Vector/vector_dist_operators.hpp

# Conflicts:
#	src/CMakeLists.txt
#	src/FiniteDifference/eq_unit_test.cpp
#	src/FiniteDifference/eq_unit_test_3d.cpp
#	src/Operators/Vector/vector_dist_operators.hpp

Fixing no petsc compile of test

See merge request openfpm/openfpm_numerics!11

Fixing Install

See merge request openfpm/openfpm_numerics!10

Odeint Extra Structures

See merge request openfpm/openfpm_numerics!9

Adding multiple checks for detecting mistakes in SE_CLASS1. Adding Odeint Examples.

See merge request openfpm/openfpm_numerics!8

Updating Odeint to make its use easier. Adding example template state types for using odeint with 1d,2d and 3d fields.

Also adding Subset number prop name.

Fd solver

See merge request openfpm/openfpm_numerics!7

Odeint multicore bug fix

See merge request openfpm/openfpm_numerics!6