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Conflicts:
	CHANGELOG.md

Add statistics for multi-level static condensation

This MR adds additional statistics when `--verbose` is enabled if multi-level static condensation is used. It outputs:
* the local/global dof statistics at the lowest level across all processes
* distribution of the lowest levels across each of the processors

Example output:
```
Assembly map statistics for field p:
  - Number of local/global dof             : 216888 151247
  - Number of local/global boundary dof    : 120528 54887
  - Number of local/global Dirichlet dof   : 133 114
  - dof valency (min/max/mean)             : 1 10 2
  - Local dof dist. (min/max/mean/dev)     : 22932 39319 30984 6106.94
  - Local bnd dof dist. (min/max/mean/dev) : 14742 19614 17218.3 1797.01
  - M-level sc. dist. (min/max/mean/dev)   : 13 15 13.8571 0.638877
Stats at lowest static cond. level:
  - Number of local/global dof             : 0 2746
  - Number of local/global boundary dof    : 4600 1875
  - Number of local/global Dirichlet dof   : 133 114
  - dof valency (min/max/mean)             : 1 9 2
  - Local bnd dof dist. (min/max/mean/dev) : 510 1096 657.143 188.189
```

See merge request !656

Fix numbering in gs for variable P

This MR fixes the ids in the gs object used for variable P, since id=0 is ignored.

See merge request !663

Update contribution guide to clarify CHANGELOG entry

A small update as suggested by @lackhove to include the CHANGELOG entry as part of the contribution guide.

See merge request !662

fix/NM-inputstar-namespace

small fix to inputstar module after the namespace clean up

See merge request !661

Fix/win10

This MR fixes issues relating to building Nektar++ on Windows 10 with Visual Studio 2015.

See merge request !641

auto detect if we are running on a shared filesystem and remove the cmdline option



See merge request !654

fix PETSc build on operating systems where python defaults to python3



See merge request !646

Variable P with periodic boundary conditions

This MR extends the variable P functionality to simulations with periodic boundary conditions.

This was a lot easier than I expected, but it seems to be working fine.

See merge request !658

Fix FC verbose option when using --procid

This MR just replaces a bunch of `GetRank() == 0` by `TreatAsRankZero()` to fix the verbose option of FieldConvert when using `--procid`.

See merge request !648

Feature/interpolator

This MR introduces an Interpolator class which adds several features/improvements over how interpolation was handled by the PtsField class:

* The brute force search algorithm was swapped for boosts rtree algorithm. This change decreases the interpolation time from hours to seconds
* Besides the modified shepard and linear/quadratic interpolation, two new algorithms, nearest neighbor and Gaussian smoothing were added
* The new class can interpolate between ptFields, ptsFields and expansions and expansions. The latter is only useful when dealing with different meshes.
* Several bugfixes

FieldConvert and EquationSystem were ported to this new class to benefit from the speedup.

This MR also includes the changes what were originally in !582

The required boost version was increased to 1.56 as this is the first version that includes geometry::rtree which works on windows

See merge request !584

Fix boundary conditions after DG optimisation

This MR fixes issues from the DG optimisation introduced in MR !555 inside the compressible flow solver, whereby MPI deadlocks under the use of most boundary conditions due to the use of `ExtractTracePhys` inside the boundary condition evaluation. This is fixed by pulling these calls out to the parent function and passing them through to the boundary condition functions, which is in fact more efficient and avoids the use of these functions repeatedly for each RHS evaluation.

See merge request !657

Fixes for Euler 1D solvers



See merge request !565